Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1d1dcc764b086e…

MALICIOUS

PDF

15.5 KB Created: 2019-10-31 23:52:27 +00:00 Authoring application: mPDF 5.7
MD5: 17fdb1b55d1fad5107d212850676f86a SHA-1: 386ae88eca2d0e15ee6d8f4de094bea8ecc199b1 SHA-256: 7a1d1dcc764b086ee6d0e53e8d9d7b8d403e2da984cbcabc9a66e197575ddfeb
90 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to external PDF documents, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious. While the URLs themselves are currently marked as benign, the sheer volume and the heuristic firing suggest an attempt to manipulate search engine results or to distribute malicious content through a link farm. The document body contains many of these URLs, reinforcing the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9778

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/1730732736738/Unteachable-by-Leah-Raeder.pdf
    • http://cefasfese.4pu.com/3731731739735/Unteachable-by-Leah-Raeder.pdf
    • http://cefasfese.4pu.com/2734732739733739/Kiss-of-a-Wolf-An-Alpha-Girl-Novella-by-Leah-D-W-.pdf
    • http://cefasfese.4pu.com/1730734739732738/The-Girl-Who-Was-on-Fire-Your-Favorite-Authors-on-Suzanne-Collins-Hunger-Games-Trilogy-by-Leah-Wilson.pdf
    • http://cefasfese.4pu.com/1731734735736735736/Du-bist-KEIN-NAZI-nur-weil-du-zu-PEGIDA-gehst-oder-AfD-w-hlst-by-Joachim-Raeder.pdf
    • http://cefasfese.4pu.com/3731731731731739/Sarah-Leah-Chase-s-Year-Around-Cookbook-by-Sarah-Leah-Chase.pdf
    • http://cefasfese.4pu.com/3736739730735735/Girl-with-the-Dragon-Tattoo-Trilogy-Bundle-The-Girl-with-the-Dragon-Tattoo-The-Girl-Who-Played-with-Fire-The-Girl-Who-Kicked-the-Hornet-s-Nest-by-Stieg-Larsson.pdf
    • http://cefasfese.4pu.com/1731731732732737/Above-by-Leah-Bobet.pdf
    • http://cefasfese.4pu.com/1731735736737736733/Leah-by-J-M-Reep.pdf
    • http://cefasfese.4pu.com/7730735732731/Leah-s-Way-by-Richard-Botelho.pdf
    • http://cefasfese.4pu.com/2737736734738738/Amaranthine-by-Leah-Crichton.pdf
    • http://cefasfese.4pu.com/2736730736736738/The-History-of-Us-by-Leah-Stewart.pdf
    • http://cefasfese.4pu.com/6737737738732/The-Messenger-by-Leah-Rose.pdf
    • http://cefasfese.4pu.com/2737730736739738/Leah-Carter-2-by-R-J-Lewis.pdf
    • http://cefasfese.4pu.com/6736734730737732/Runner-Up-by-Leah-Banicki.pdf
    • http://cefasfese.4pu.com/6737733737733737/Amour-Mortel-by-Leah-D-W-.pdf
    • http://cefasfese.4pu.com/2739739731730735/Falling-For-Rapunzel-by-Leah-Wilcox.pdf
    • http://cefasfese.4pu.com/1737739731737730/Sacred-Ring-by-Leah-Sanders.pdf
    • http://cefasfese.4pu.com/1738733737733734/Seeing-the-Elephant-Wildflowers-1-by-Leah-Banicki.pdf
    • http://cefasfese.4pu.com/2731736737735739/Owning-It-by-Leah-Marie-Brown.pdf

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