Finding a formal academic paper specifically for is unlikely because that specific string describes a pirated ("nulled") version of a Paid-To-Click (PTC) software distributed on "warez" forums.

: Many nulled scripts, like the "Nextgen" variants found on sites like Babele or Omnibook, include hidden "display:none" links or redirects that steal your site's SEO authority to boost the hacker's sites.

This is the most critical part of the query. In software terminology, "nulled" refers to commercial software that has been modified to remove its copy protection or licensing requirements.

These terms are frequently found in the titles of pirate forums or low-reputation file-sharing sites where pirated "nulled" versions of scripts are distributed.

Malicious code can steal sensitive information, including user login credentials and financial details.