  URLs are central to a myriad of cyber-security threats, from phishing to the
distribution of malware. Their inherent ease of use and familiarity is
continuously abused by attackers to evade defences and deceive end-users.
Seemingly dissimilar URLs are being used in an organized way to perform
phishing attacks and distribute malware. We refer to such behaviours as
campaigns, with the hypothesis being that attacks are often coordinated to
maximize success rates and develop evasion tactics. The aim is to gain better
insights into campaigns, bolster our grasp of their characteristics, and thus
aid the community devise more robust solutions. To this end, we performed
extensive research and analysis into 311M records containing 77M unique
real-world URLs that were submitted to VirusTotal from Dec 2019 to Jan 2020.
From this dataset, 2.6M suspicious campaigns were identified based on their
attached metadata, of which 77,810 were doubly verified as malicious. Using the
38.1M records and 9.9M URLs within these malicious campaigns, we provide varied
insights such as their targeted victim brands as well as URL sizes and
heterogeneity. Some surprising findings were observed, such as detection rates
falling to just 13.27% for campaigns that employ more than 100 unique URLs. The
paper concludes with several case-studies that illustrate the common malicious
techniques employed by attackers to imperil users and circumvent defences.
