Malicious PDF — malware analysis report

Static analysis result for SHA-256 4523a81ffc351beb…

MALICIOUS

PDF

21.1 KB Created: 2019-05-07 06:20:21 +01:00 Authoring application: mPDF 5.7
MD5: 3f7267e9f35714f75a51273e13218a6d SHA-1: a8c10df87fa33d4c57ad8add6b653eb4588f79ea SHA-256: 4523a81ffc351beb3f8bcde1f718331b91509915e5944ceb7191edaca96016f5
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF was flagged by a critical heuristic for containing a mass external PDF link farm, with 27 links identified. The ML classifier also strongly indicated maliciousness. While the document body is unreadable, the presence of numerous links to other PDFs, many with long, descriptive titles, suggests an attempt to manipulate search engine results or to host a large number of potentially malicious documents. The URLs themselves appear to be benign, but the pattern of linking is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 2

  • 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.
  • 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://seasasac.lflinkup.com/5da8da8da1da9da5/The-Crystal-Heart-Enthralled-1-by-Prax-Venter.pdf
    • http://seasasac.lflinkup.com/8da8da9da9da1/Attractions-of-the-Heart-by-Cheri-Crystal.pdf
    • http://seasasac.lflinkup.com/4da1da5da4da7da0/Play-Your-Heart-Out-Sinful-Serenade-4-by-Crystal-Kaswell.pdf
    • http://seasasac.lflinkup.com/2da5da6da2da6da0/Breathing-Enthralled-2-by-Laura-Baumbach.pdf
    • http://seasasac.lflinkup.com/2da7da8da6da2da2/Secrets-of-the-Heart-A-Christian-Suspense-Romance-Novel-The-Crystal-Cove-Series-1-by-Kelsey-MacBride.pdf
    • http://seasasac.lflinkup.com/8da2da0da9da2da7/Nag-Van-Die-Narre-by-Peet-Venter.pdf
    • http://seasasac.lflinkup.com/8da7da6da9da6da0/Die-Liebe-des-Massai-by-Vanessa-V-Venter.pdf
    • http://seasasac.lflinkup.com/4da1da5da1da3da7/The-Crystal-Healer-Crystal-prescriptions-that-will-change-your-life-forever-by-Philip-Permutt.pdf
    • http://seasasac.lflinkup.com/1da0da3da6da8da6da8/Crystal-Energy-A-Practical-Guide-to-the-Use-of-Crystal-Cards-for-Rejuvenation-and-Health-by-Monnica-Hackl.pdf
    • http://seasasac.lflinkup.com/1da5da9da6da5da0/Crystal-Line-Crystal-Singer-3-by-Anne-McCaffrey.pdf
    • http://seasasac.lflinkup.com/2da0da3da8da7da0/Zelda-and-the-Crystal-Slippers-The-Crystal-Adventures-1-by-R-W-Mitchell.pdf
    • http://seasasac.lflinkup.com/4da3da3da8da4da3/Crystal-Traveler-Crystal-Message-Chronicles-1-by-R-B-Breighton.pdf
    • http://seasasac.lflinkup.com/4da6da8da4da8da7/Crystal-Fire-Tales-of-the-Crystal-Book-One-by-R-L-Kiser.pdf
    • http://seasasac.lflinkup.com/5da5da9da5da5da5/Zelda-and-the-Crystal-Lamp-The-Crystal-Adventures-2-by-R-W-Mitchell.pdf
    • http://seasasac.lflinkup.com/4da4da7da4da1da7/Life-at-the-Speed-of-Light-From-the-Double-Helix-to-the-Dawn-of-Digital-Life-by-J-Craig-Venter.pdf
    • http://seasasac.lflinkup.com/7da9da8da7da2da5/Portugal-s-Guerrilla-Wars-in-Africa-Lisbon-s-Three-Wars-in-Angola-Mozambique-and-Portuguese-Guinea-1961-74-by-Al-J-Venter.pdf
    • http://seasasac.lflinkup.com/1da1da1da9da4da9/Crystal-Doors-Crystal-Doors-1-by-Rebecca-Moesta.pdf
    • http://seasasac.lflinkup.com/7da1da7da5da1da0/Heart-Chakra-Cleansing-A-Guide-to-Heart-Chakra-Meditation-and-Heart-Chakra-Healing-by-Priya-Chevallier.pdf
    • http://seasasac.lflinkup.com/3da8da4da7da8da7/Loving-Our-Kids-on-Purpose-Making-a-Heart-To-Heart-Connection-by-Danny-Silk.pdf
    • http://seasasac.lflinkup.com/3da9da1da3da7da1/The-New-Heart-of-Wisdom-Profound-Teachings-from-Buddha-s-Heart-by-Geshe-Kelsang-Gyatso.pdf
    • http://seasasac.lflinkup.com/1da0da3da6da8da6da8/Crystal-Energy-A-Practical-Guide-to-the