I don't believe that Tinyurl.com is in any way a suspicious source. Certainly it (along with almost ANY web site can be used for nefarious purposes).
If you are at all concerned there actually are websites that can be used to expand upon a shortened link to it's original value; take a look at for instance at
http://longurl.org/ ; simple Google searches can find many other sites offering the same service.
That Tinyurl.com link expands to
http://download.kobobooks.com/vox/apps/SystemPatch.apk
Also if you are at all concerned about security, most people would advise you to NEVER click on an URL in an eMail but rather to type it in yourself.