A peculiar spam campaign is underway that contains links that redirect you to fake NSFW (not-safe-for-work) adult dating sites or affiliate sites for sites like Ashleymadison.com. After analysis by a researcher, it was discovered that blocking 7 IP addresses could protect your network from over 4,600 adult spam and malware domains. Security researcher DanielGallagher who focuses on finding correlations between different types of data researched the IP addresses associated with this spam and came up with some interesting insights.
Source: https://www.bleepingcomputer.com/news/security/spam-campaign-follows-the-white-rabbit-to-nsfw-phishing-scams/