Malicious PDF — malware analysis report

Static analysis result for SHA-256 53cb4cc68a616667…

MALICIOUS

PDF

58.4 KB Created: 2020-04-06 05:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0dc46c83b0a866cd10f429858fdcb049 SHA-1: 12722508b8efce21e455a4ef826ed9fdf81d645f SHA-256: 53cb4cc68a616667020328791fe72eddbc9974a599a93586850987a01a6d3940
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, many of which point to other PDFs hosted on various domains. This pattern is indicative of a link farm designed to manipulate search engine rankings or distribute traffic. The ML classifier strongly flagged this PDF as malicious, supporting the interpretation that these links are part of a malicious scheme rather than legitimate content. No scripts were extracted, and the document body text is heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://myfairrealty.com/uploads/1/3/0/8/130813458/130813458.html#artistas+rock+urbano+mexicano
    • http://ndhumanities.org/uploads/1/3/1/3/131398368/6d35baa.pdf
    • http://mibest.se/uploads/1/3/0/4/130476237/235792.pdf
    • http://roughedges.net/uploads/1/3/1/3/131384211/4174878.pdf
    • http://campaignartwork.com/uploads/1/3/0/7/130738620/5380936.pdf
    • http://openmeadowfarms.com/uploads/1/3/0/6/130620826/7ce3d8a.pdf
    • http://eclectic-elegance.com/uploads/1/3/1/4/131437299/1c2dc27.pdf
    • http://pampanga-properties.com/uploads/1/3/0/6/130603928/dacc6.pdf
    • http://kaizensalonandspa.com/uploads/1/3/0/5/130550809/1c646bbcc850ee.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_off0000b7f1.bin
c441c2daeefb348d4142afb8dd0de0237f7c68d6ec34464422632700beabcd93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F1 9900 bytes

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