Malicious PDF — malware analysis report

Static analysis result for SHA-256 1daadf5f7a32a093…

MALICIOUS

PDF

16.5 KB Created: 2020-01-02 06:05:17 +00:00 Authoring application: mPDF 5.7
MD5: dc02ce1786f59cfb87f047f90d53d00e SHA-1: 7a1c5589c39bd1b88bad078e3d7b446e797f822b SHA-256: 1daadf5f7a32a093935460b312f7a3615bf1cbe99c37f40d7d1aeaa5d2d3af2e
90 Risk Score

Malware Insights

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

The PDF file was flagged by a critical heuristic for containing a large number of external links, indicating a link farm. While most individual URLs were marked as benign, the sheer volume and the heuristic's classification suggest a malicious intent, likely for SEO poisoning or to distribute further malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was unreadable, so the rationale is based on the PDF structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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/4739735736736735/Curve-My-Heart-The-Curvies-by-Sarah-Gai.pdf
    • http://cefasfese.4pu.com/7733734735731732/Curve-My-Song-The-Curvies-1-by-Sarah-Gai.pdf
    • http://cefasfese.4pu.com/1732733733738733/Curve-My-Song-The-Curvies-1-by-Sarah-Gai.pdf
    • http://cefasfese.4pu.com/4735732735733736/Love-s-Learning-Curve-Learning-Curve-1-by-Felicia-Lynn.pdf
    • http://cefasfese.4pu.com/5730732730730730/Cold-My-Heart-by-Sarah-Woodbury.pdf
    • http://cefasfese.4pu.com/2733733731731737/The-Heart-of-Aces-by-Sarah-Sinnaeve.pdf
    • http://cefasfese.4pu.com/2736732733/Assassin-s-Heart-Assassin-s-Heart-1-by-Sarah-Ahiers.pdf
    • http://cefasfese.4pu.com/4737735732732735/Cold-My-Heart-The-Lion-of-Wales-1-by-Sarah-Woodbury.pdf
    • http://cefasfese.4pu.com/2731737731735735/Lovesick-Quarterback-Winning-Sarah-s-Heart-Serial-8-by-H-T-Night.pdf
    • http://cefasfese.4pu.com/2731737731733734/Something-Special-About-Silence-Winning-Sarah-s-Heart-Serial-5-by-H-T-Night.pdf
    • http://cefasfese.4pu.com/3730733732730736/Eleven-Scandals-to-Start-to-Win-a-Duke-s-Heart-by-Sarah-MacLean.pdf
    • http://cefasfese.4pu.com/3733738730734739/Nine-Hills-to-Nambonkaha-Two-Years-in-the-Heart-of-an-African-Village-by-Sarah-Erdman.pdf
    • http://cefasfese.4pu.com/6736734734734/Nine-Hills-to-Nambonkaha-Two-Years-in-the-Heart-of-an-African-Village-by-Sarah-Erdman.pdf
    • http://cefasfese.4pu.com/1730730730738736/The-Amateur-Historians-Guide-to-the-Heart-of-England-Nearly-200-Medieval-amp-Tudor-Sites-Two-Hours-or-Less-from-London-by-Sarah-Valente-Kettler.pdf
    • http://cefasfese.4pu.com/3733737734737737/Curve-Day-by-L-R-Currell.pdf
    • http://cefasfese.4pu.com/2736736733730731/Curve-Day-by-L-R-Currell.pdf
    • http://cefasfese.4pu.com/3735737730738739/Thrown-for-a-Curve-by-Kit-Sergeant.pdf
    • http://cefasfese.4pu.com/3738734734734732/Curve-by-Carrie-Brennan.pdf
    • http://cefasfese.4pu.com/7733734735731735/The-Curve-A-Novel-by-Jeremy-Blachman.pdf
    • http://cefasfese.4pu.com/9737736739733/The-Learning-Curve-by-Melissa-Nathan.pdf
    • http://cefasfese.4pu.com/3733738730734739

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