Webpushpull.com is a fake website designed to look like a human verification step. It uses social engineering methods to trick people into subscribing to push notifications. People are asked to press the “Allow” button to verify that they are not robots.
However, users start getting spammed with annoying pop-up ads that can appear even when the browser is closed instead of gaining access to the content. The creators of the page could be using rogue advertising networks that place ads leading to dangerous websites.