Malicious PDF — malware analysis report

Static analysis result for SHA-256 911c33a6b25905e7…

MALICIOUS

PDF

46.0 KB Created: 2020-11-08 06:04:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 280aa1fa82fcf5da32a4cf55c76c21b5 SHA-1: 5f1f1f03e8d0909c84da2880a489f8119b944777 SHA-256: 911c33a6b25905e7c43a507adf7d9169e8dfb95cb208dde56eb10f48b9cd7077
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains embedded URLs and a document body that appears to be a lure related to 'Z edge dash cam support'. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, suggesting an attempt to direct users to malicious or spam content. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it is used for malicious purposes, likely to drive traffic to the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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 https://trafffi.ru/123?keyword=z+edge+dash+cam+support
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5f89a85d6ce0e.pdf
    • https://cdn-cms.f-static.net/uploads/4380680/normal_5fa658848f362.pdf
    • https://cdn-cms.f-static.net/uploads/4451754/normal_5fa5e4252c1f8.pdf
    • https://cdn-cms.f-static.net/uploads/4380695/normal_5f91be4c12b8b.pdf
    • https://cdn-cms.f-static.net/uploads/4369311/normal_5f8ed8e28c6ec.pdf
    • https://cdn-cms.f-static.net/uploads/4404723/normal_5f9552f2b41c6.pdf
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f92a92ba5db9.pdf
    • https://cdn-cms.f-static.net/uploads/4412161/normal_5f976ff3b2099.pdf
    • https://cdn-cms.f-static.net/uploads/4450419/normal_5f9edbf4319a2.pdf
    • https://cdn-cms.f-static.net/uploads/4412181/normal_5f9542f840949.pdf
    • https://cdn-cms.f-static.net/uploads/4427514/normal_5fa2ddf385a2f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fovekurosuto.files.wordpress.com/2020/11/92915359040.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000754d.bin
d5bd6717936a73249d2b171a2412d3868224770a8514ad3c733b675ccedb185c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x754D 5412 bytes
font_01_sfnt_off00008793.bin
33b30031c4ec443e5bbcffcbf4275b03ed5abde1a02728f8c6d7408da3beece5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8793 10528 bytes

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