Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8ab06435109109…

MALICIOUS

PDF

28.9 KB Created: 2020-04-11 21:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 990440e6330e65526beac45a2027a818 SHA-1: 1471566b8974cd6aa3b53bb6768215955607f2af SHA-256: cf8ab06435109109a28d27ec3c4460d802e7a22eec65e18adea4c35117191859
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. No scripts were extracted, and the document body was largely unreadable binary data, making it difficult to determine the exact lure. The primary attack pattern involves leveraging a link farm to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://catwalk.it/uploads/1/3/0/3/130379083/130379083.html#causa+de+la+gran+depresion+de+1929
    • http://silentmanfilm.com/uploads/1/3/0/4/130488580/xelutumobojufas_zojin.pdf
    • http://gauthierindustrialservices.com/uploads/1/3/0/6/130604394/tixupomejulelu.pdf
    • http://enhancehospitlaity.com/uploads/1/3/0/3/130379627/565a36.pdf
    • http://home4birds.com/uploads/1/3/1/4/131438839/bijuro.pdf
    • http://elevate-asia.com/uploads/1/3/0/3/130313293/popukezenim.pdf
    • http://russcrickphotography.com/uploads/1/3/1/0/131069860/5309744.pdf
    • http://adphiladelphia.com/uploads/1/3/0/6/130639175/xobufakaxutedev_silakixumajavuz.pdf
    • http://gauthier

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