what about //cdn.optmd.com (I've redirected unintentionally )

An internet site ( searching to remove detergent concretion from pipes) under Safari has redirected me to URL containg //cdn. optmd.com after initial http ( I write this way to be sure not to create a link ) .

That URL activated a popup from Zeobit to promote Mac maintenance.

I didn't accepted anything but Safari was blocked.

I went to the Apple (main) menu to force Safari to quit. Now it seems Safari runs again without trouble in my sight ( not professionnal ).

Has my Mac be intruded by this unasked pop up invader ?

Since last weeks news and papers are speaking about Apple products being under attacks.

What's Apple's ressource ?

Any App to run to test the whole stuff ?

Thank you in advance.

Dr Fritschke from Belgium