Malicious PDF — malware analysis report

Static analysis result for SHA-256 987d14a649f8cd07…

MALICIOUS

PDF

14.5 KB Created: 2019-11-07 20:31:43 +00:00 Authoring application: mPDF 5.7
MD5: 99910227e572da0edc4a1e84dd2a613c SHA-1: 2aee3578debb5a41b33828251d766a3c74089aff SHA-256: 987d14a649f8cd075a3aaa183e153e2cfc243b1404f369de8661e3dfd322a5b4
90 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, identified as a link farm. While the URLs themselves appear to point to legitimate content, the sheer volume and the heuristic firing of PDF_SEO_LINK_FARM suggest a malicious intent to manipulate search engine results or redirect users. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

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://cefasfese.4pu.com/3733737730738730/The-Walking-Dead-Vol-28-A-Certain-Doom-by-Robert-Kirkman.pdf
    • http://cefasfese.4pu.com/3732737730732737/The-Walking-Dead-Book-Fifteen-The-Walking-Dead-169-180-by-Robert-Kirkman.pdf
    • http://cefasfese.4pu.com/2730738732739733/The-Walking-Dead-Book-Eleven-The-Walking-Dead-121-132-by-Robert-Kirkman.pdf
    • http://cefasfese.4pu.com/3735739731738733/The-Walking-Dead-Book-Six-The-Walking-Dead-61-72-by-Robert-Kirkman.pdf
    • http://cefasfese.4pu.com/3735739731739731/The-Walking-Dead-Book-Seven-The-Walking-Dead-73-84-by-Robert-Kirkman.pdf
    • http://cefasfese.4pu.com/4736732738730733/The-Walking-Dead-Days-Gone-Bye-The-Walking-Dead-1-by-Robert-Kirkman.pdf
    • http://cefasfese.4pu.com/3737731731734/The-Walking-Dead-Book-One-The-Walking-Dead-1-12-by-Robert-Kirkman.pdf
    • http://cefasfese.4pu.com/5738732731730730/The-Walking-Dead-Book-Nine-The-Walking-Dead-97-108-by-Robert-Kirkman.pdf
    • http://cefasfese.4pu.com/1737739732732734/The-Walking-Dead-Book-Eight-The-Walking-Dead-85-96-by-Robert-Kirkman.pdf
    • http://cefasfese.4pu.com/3731731732739/The-Walking-Dead-Vol-18-by-Robert-Kirkman.pdf
    • http://cefasfese.4pu.com/2733738733731/The-Walking-Dead-Vol-10-What-We-Become-by-Robert-Kirkman.pdf
    • http://cefasfese.4pu.com/4730736733737739/The-Walking-Dead-Vol-21-All-Out-War-Part-2-by-Robert-Kirkman.pdf
    • http://cefasfese.4pu.com/3730733737733735/The-Walking-Dead-Issue-5-by-Robert-Kirkman.pdf
    • http://cefasfese.4pu.com/3739733736733739/The-Walking-Dead-Vol-17-Something-to-Fear-by-Robert-Kirkman.pdf
    • http://cefasfese.4pu.com/9730739733735737/The-Walking-Dead-Issue-28-by-Robert-Kirkman.pdf
    • http://cefasfese.4pu.com/1730735734736/The-Walking-Dead-Vol-12-Life-Among-Them-by-Robert-Kirkman.pdf
    • http://cefasfese.4pu.com/3730733734732737/The-Walking-Dead-Issue-1-by-Robert-Kirkman.pdf
    • http://cefasfese.4pu.com/1731739738731730731/The-Walking-Dead-Book-8-by-Robert-Kirkman.pdf
    • http://cefasfese.4pu.com/8732739735739/The-Walking-Dead-Vol-9-Here-We-Remain-by-Robert-Kirkman.pdf
    • http://cefasfese.4pu.com/9731735739735735/The-Walking-Dead-Issue-43-by-Robert-Kirkman.pdf
    • http://cefasfese.4pu.com/2733738733731/The-W

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