Or something with similar name has downloaded itself onto my phone when I was browsing novelupdates. When I noticed I immediately went to download folder and found another file with similar name already there. Of the tabs I was browsing only novelupdates was loaded.
I never experienced it before. Do you have screenshot of the nu page? Does the problem persist when you use different browser? In the mean time turn on ad blocker and scan your phone.
I was told it wasn't from my site. How sure are you that it's coming from NU? Try clearing your cache. Here's the reply I got back from the ticket I opened: