Malicious PDF — malware analysis report

Static analysis result for SHA-256 854cd332f57c134e…

MALICIOUS

PDF

39.5 KB Created: 2020-04-08 01:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2d799a300e15b370f3f70796acc41e53 SHA-1: 4cf5c3562fdbecadc1099159cc62b1e48d592205 SHA-256: 854cd332f57c134e11875bca4dc66d9fabdd4600c986c680fea9a399164bc099
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded links. No scripts were extracted, and the document body was largely unreadable, but the heuristic firings clearly point to a link distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://johorabortionpill.com/uploads/1/3/1/3/131381886/131381886.html#pdf+x+change+viewer
    • http://puremichiganguns.com/uploads/1/3/0/4/130476091/sanogujenad.pdf
    • http://tickproject.com/uploads/1/3/1/3/131382828/jejedafomu.pdf
    • http://merrillcapitalpartners.net/uploads/1/3/0/3/130313107/66618b43.pdf
    • http://posterprintingforbands.com/uploads/1/3/0/5/130588214/salilogutoxer.pdf
    • http://seahillfarm.com/uploads/1/3/0/6/130620605/6339152.pdf
    • http://pro-cleanwindows.net/uploads/1/3/0/5/130588560/00b93ef12d48c.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000704e.bin
4e9505995d6ff1d7394a6f49f17401656aefe4ebf21f7a73b3049a5306e1eac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x704E 8388 bytes

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