How to redirect to a file

I have a question regarding the rewrite rule in my app. One of my JS files that is built by other team request a file that is not in our domain. I am trying to set a rewrite rule to make it redirect to another page in my .htaccess. file when the file request happens.

For example: My current console log shows

GET http://ift.tt/1DBe4VY 404 (Not Found)

I want to redirect it to

http://ift.tt/1IluiCE to process the correct file. 

My rewrite rule

RewriteCond %{REQUEST_URI} /file.object
RewriteRule ^.*$ /processLink/ [R=302]

It doesn't work. I am a bit rusty on the rewrite rules. Can anyone help me about it? Thanks so much!