Hello! Recently noticed on their site an incomprehensible js script that sends users spam push notifications. For a long time they figured out and it turned out that this file is substituted through the cloudflare cache. type link - https://www.domain.ru/ws.js
there is no 100% ws.js file on the server! After clearing the cache, a 404 error pops up on the link, but after a few seconds of updates this file opens again
If caching is completely turned off, then this file stops opening.
How can this be?