Spam ? Scam? Shutting down MN. Popping on screen as I am typing on a thread

[Cormoran]

I was typing a reply and my whole screen was taken over by a scammy ad , I guess? Mumsnet disappeared . The URL was this one https://luckyvybz.top/bonus/com-au-8834/global-bb.php?c=52z90106z6lz0&k=d616a09eb739d45ca151ee5ec21942a8&country_code=AU&carrier=Optus&country_name=Australia&region=Victoria&city=Frankston&isp=Microplex%20PTY%20LTD&lang=en&ref_domain=www.mumsnet.com&os=Mac%20OS%20X&osv=10.15&browser=Safari&browserv=&brand=Desktop&model=Desktop&marketing_name=Desktop&tablet=4&rheight=768&rwidth=768&t1=375299598237ee450425&t2=mumsnet.com&t3=usfo-adstork-smh-cpm-rtb-bn&t4=175.32.208.86&t5=safari&t6=macos&t7=&t8=AU&t9=1j7c4c4e3b3c9j4o7o4c7y4g7&t10=caynt1&t11=mumsnet.com_d0b16dc56126edec6ed87a88de11e718&t12=1186ef66ffb8ba24db9793f044e7c7ea&t13=3%7C%7Cmumsnet.com%7C%7Cmumsnet.com%7C%7Cmumsnet.com&t14=eval&t15=&et1=displaymanager:Unknown&et2=120x600&et3=&et4=&et5=&e=5

Pretty sure it is a scam.
I am in Australia, on a Mac, on Safari , Big Sur, 11.7.10

Have you run a virus scan?

Yes, all good. Thanks.