Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ba602c0b62fbac…

MALICIOUS

PDF

42.6 KB Created: 2020-04-03 16:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e20a39c32f6e55780562503b4863b83f SHA-1: 4d05203c6b2bfdc84579d6c978620b93c0da2eb9 SHA-256: d0ba602c0b62fbac8d6af7919cbc6075c2460b898406d7ab67bf5f24af315bd2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, many of which point to other PDF files on various domains. This behavior is indicative of a link farm or SEO poisoning attack, designed to drive traffic to specific sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that these links are part of a malicious distribution or redirection scheme. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the immediate payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://alcyouthsports.com/uploads/1/3/0/8/130873890/130873890.html#edge+parity+5x5
    • http://spillerwilliams.com/uploads/1/3/1/1/131164077/7637620.pdf
    • http://krockers.com/uploads/1/3/0/5/130543373/nosidufadetova-xivinusaraw-zeridegujawe.pdf
    • http://melbournegpstracking.com/uploads/1/3/1/3/131380594/pusodijavugeg-liribunipadiwad-sidep.pdf
    • http://excelsiorsjra.com/uploads/1/3/0/7/130775395/duxulenovikituf_rolubuwawudo_bugomolaz_jerepudizex.pdf
    • http://groupama-assurances-guadeloupe.fr/uploads/1/3/0/2/130289185/rerovez_fizovumujal_sozaminusuwuso_zuzagulane.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_off00008149.bin
40f55ac9c2609ac5e0f2291fb4b4ac62a54198714a8be9708b7b51850316d3b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8149 7400 bytes

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