Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ccbe2be7b7fe9f…

MALICIOUS

PDF

38.2 KB Created: 2020-04-23 11:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 369beaca878deafd52d15e9eaa2966f7 SHA-1: 7b6136c9e0bd24652e18722ea709c8c3aa119f84 SHA-256: 42ccbe2be7b7fe9ff2c62eb1f14e4910a6aae0aba2d9689b9ad5ddd1cc556630
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. The primary purpose appears to be directing users to a network of seemingly unrelated PDF documents, likely to manipulate search engine rankings or host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://preciousdollsragdolls.com/uploads/1/3/1/6/131636977/131636977.html#belmar+nj+blue+fishing+reports
    • http://charming2atee.net/uploads/1/3/0/7/130775063/c0de876945f791.pdf
    • http://stchristopherscodsall.com/uploads/1/3/0/6/130640097/630f3e479547b.pdf
    • http://pathoflifefdn.org/uploads/1/3/1/4/131454932/02bd7.pdf
    • http://dianahartmanconservation.com/uploads/1/3/0/3/130323647/6d29506013.pdf
    • http://michellesgym.com/uploads/1/3/0/4/130436094/8416676.pdf
    • http://whitneyelliott.com/uploads/1/3/0/5/130588846/nalagotuvu.pdf
    • http://miacarterbooks.com/uploads/1/3/1/3/131382382/8154380.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b26.bin
6b6e03fa8877a5a75f374389471a39b3155f77f21182634a8e039b44ee8b0c42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B26 7180 bytes
font_01_sfnt_off00007775.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7775 16204 bytes

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