I have a list of infected files, will it help you?

No. These types of lists usually only contain files that contain malicious JS scripts or obfuscated PHP code. These code snippets are just symptoms of infection, and these codes are easy to remove.

The bigger problem lies elsewhere. First, we need to look for a vulnerability (a bug or a security vulnerability) that allowed the attacker to inject these malicious code fragments onto the website – and this, unfortunately, will not be detected by any machine.