What do these requests intend to do?

A strange ip sent the requests shown in the nginx log below, but what did it intend to do?

I recently set up a webserver using nginx, then, I got these requests.

Thanks in advance for useful information.

185.234.217.41 - - [30/Jun/2019:19:35:11 -0700] "GET /wallet.dat HTTP/1.1" 404 5483 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0" "-" 185.234.217.41 - - [30/Jun/2019:19:35:12 -0700] "GET /node/wallet.dat HTTP/1.1" 404 5483 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0" "-" 185.234.217.41 - - [30/Jun/2019:19:35:12 -0700] "GET /hidden/wallet.dat HTTP/1.1" 404 5483 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0" "-" 185.234.217.41 - - [30/Jun/2019:19:35:13 -0700] "GET /wallet/wallet.dat HTTP/1.1" 404 5483 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0" "-" 185.234.217.41 - - [30/Jun/2019:19:35:14 -0700] "GET /btc/wallet.dat HTTP/1.1" 404 5483 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0" "-" 185.234.217.41 - - [30/Jun/2019:19:35:14 -0700] "GET /bitcoin/wallet.dat HTTP/1.1" 404 5483 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0" "-" 185.234.217.41 - - [30/Jun/2019:19:35:15 -0700] "GET /.bitcoin/wallet/wallet.dat HTTP/1.1" 404 5483 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0" "-" 185.234.217.41 - - [30/Jun/2019:19:35:15 -0700] "GET /.bitcoin/wallet.dat HTTP/1.1" 404 5483 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0" "-" 185.234.217.41 - - [30/Jun/2019:19:35:16 -0700] "GET /core/wallet.dat HTTP/1.1" 404 5483 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0" "-" 185.234.217.41 - - [30/Jun/2019:19:35:17 -0700] "GET /coin/wallet.dat HTTP/1.1" 404 5483 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0" "-" 185.234.217.41 - - [30/Jun/2019:19:35:17 -0700] "GET /backup/wallet.dat HTTP/1.1" 404 5483 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0" "-" 185.234.217.41 - - [30/Jun/2019:19:35:18 -0700] "GET /bitcoin/wallet/wallet.dat HTTP/1.1" 404 5483 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0" "-" 185.234.217.41 - - [30/Jun/2019:19:35:19 -0700] "GET /crypto/wallet.dat HTTP/1.1" 404 5483 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0" "-"