Google for invalidating a bunk of CloudFront files and you’ll find many utilities to help you, but did you know you can do it easily through the AWS Console?
Just visit CloudFront > Distribution Settings > Invalidations > Create Invalidation
Now provide the folder and wildcard to blow away a bunch of files!
i.e. images/*
See, and you did not need to write a rate controlled script, pay a 3rd party monthly website, or enter your secret AWS credentials into some shady webapp!