My site redirects to someone else?

When first entering the website with a clean cookies redirects to some random site. When re-entering everything becomes approx. the Site is made in WordPress. Plugin left not set. Today, nothing on the website have not changed. What could be the problem?
June 10th 19 at 14:52
1 answer
June 10th 19 at 14:54
Start to provide the website so we know what we do)

And check the file functions.php topics
install wordfence and scan website

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