Unknow Zip file auto download by itself

I use IDM on Firefox Don't know where to ask this problem. Because this file are on your server, So please help me what is this file its keep download by itself (Malware or Virus?). The download window pop out when i'm use other program (such as while i'm watch video, chat with friend in discoard). I try to open the link but error show as image attach. Here is the link. https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/flow/ov1/168290003:1740305659:OnhYP_8A5hpyznBQHLacTN13U1j_NjmRUOBB07XXCic/916684cbe9572dac/tZ6y2QtMvdWYmTijRgzZK75bLfLxbi3AzOEpotbuCxQ-1740306398-1.1.1.1-pDIxvwDTacJGAgwY5hi.nwwx.Nz8eFdM7w0taC3OD3ryyYR1lL.r1Itc5oPQmeAp