.htaccess - How to redirect from pdf to html on mobile

I tried using other users' answers to similar questions, but it's no use. How can I redirect from http://ift.tt/2i1izlR to http://ift.tt/2hVttMq if the user is accessing the link in a smarthphone?

I suppose i got the first thing right, and that is detecting the user is in a mobile, but i can't do the redirect correctly.

RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} "android|blackberry|googlebot-mobile|iemobile|iphone|ipod|#opera mobile|palmos|webos" [NC]