Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb78269517de4372…

MALICIOUS

PDF

17.2 KB Created: 2019-06-04 09:48:26 +01:00 Authoring application: mPDF 5.7
MD5: f38526deeb95dcc550622b59adc7483d SHA-1: ef96d0d8ff18984d73a0b499c47248fcb3a57c05 SHA-256: cb78269517de43727edddb4b48f7d64a83db5efbe95cc86218889f09b0e530a2
90 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, identified by the PDF_SEO_LINK_FARM heuristic, which strongly suggests a link farm or SEO spamming operation. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted from this sample. The primary attack pattern involves directing users to external content, likely to generate traffic or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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/1733730737738/Escape-from-Mr-Lemoncello-s-Library-Mr-Lemoncello-s-Library-1-by-Chris-Grabenstein.pdf
    • http://cefasfese.4pu.com/1730739737738733734/Escape-from-Mr-Lemoncello-s-Library-by-Chris-Grabenstein.pdf
    • http://cefasfese.4pu.com/2734735736/Mr-Lemoncello-s-Library-Olympics-Mr-Lemoncello-s-Library-2-by-Chris-Grabenstein.pdf
    • http://cefasfese.4pu.com/4735738739738735/Riley-Mack-and-the-Other-Known-Troublemakers-by-Chris-Grabenstein.pdf
    • http://cefasfese.4pu.com/2738737734735735/Mad-Mouse-John-Ceepak-Mystery-2-by-Chris-Grabenstein.pdf
    • http://cefasfese.4pu.com/2739736732731736/Whack-A-Mole-John-Ceepak-Mystery-3-by-Chris-Grabenstein.pdf
    • http://cefasfese.4pu.com/2736738735731/Tilt-a-Whirl-John-Ceepak-Mystery-1-by-Chris-Grabenstein.pdf
    • http://cefasfese.4pu.com/1731734739732738/Hell-Hole-John-Ceepak-Mystery-4-by-Chris-Grabenstein.pdf
    • http://cefasfese.4pu.com/6732739731735730/Escape-and-Evasion-by-Chris-McNab.pdf
    • http://cefasfese.4pu.com/2733739733730/The-Acme-Novelty-Library-13-by-Chris-Ware.pdf
    • http://cefasfese.4pu.com/3733738730739739/The-Acme-Novelty-Library-17-by-Chris-Ware.pdf
    • http://cefasfese.4pu.com/2733739731734/The-Acme-Novelty-Library-15-Joke-Book-II-by-Chris-Ware.pdf
    • http://cefasfese.4pu.com/2739738732739733/Reading-Allowed-True-Stories-and-Curious-Incidents-from-a-Provincial-Library-by-Chris-Paling.pdf
    • http://cefasfese.4pu.com/1731731738739736738/The-Kohn-Hennig-Library-A-Catalog-by-The-South-Caroliniana-Library.pdf
    • http://cefasfese.4pu.com/3737738739737738/Escape-From-Destiny-Escape-1-by-Mikelle-Fraizer.pdf
    • http://cefasfese.4pu.com/1730737738733737/The-Escape-Escape-1-by-Lindsay-Luterman.pdf
    • http://cefasfese.4pu.com/7731738732733736/The-Story-of-My-Escape-The-Story-of-My-Escape-from-the-Prisons-of-the-Republic-of-Venice-Otherwise-Known-as-the-Leads-by-Giacomo-Casanova.pdf
    • http://cefasfese.4pu.com/6734734737730731/Chronicles-The-Library-of-Illumination-The-Library-of-Illumination-1-5-by-C-A-Pack.pdf
    • http://cefasfese.4pu.com/9730734733735/Library-Mouse-Library-Mouse-1-by-Daniel-Kirk.pdf
    • http://cefasfese.4pu.com/1730734735738733/The-Invisible-Library-The-Invisible-Library-1-by-Genevieve-Cogman.pdf
    • http://cefasfese.4pu.com/2733739731734/Th

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