Malicious PDF — malware analysis report

Static analysis result for SHA-256 a691d11296de55d5…

MALICIOUS

PDF

46.8 KB Created: 2020-11-03 19:52:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45470e1618200c54c45a48041644b07e SHA-1: 5c8dc2750a481e255e8d29f8644c513b589e987c SHA-256: a691d11296de55d5ecfa5685e986a77a691c791fb5d777306d646e3a86742406
94 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL and text suggesting a "quiz" lure. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a malicious link embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://ttraff.com/123?keyword=worlds+easiest+game+quiz
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5f874a5831a84.pdf
    • https://cdn-cms.f-static.net/uploads/4414696/normal_5f954808222fc.pdf
    • https://cdn-cms.f-static.net/uploads/4387702/normal_5f91f2ec44471.pdf
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/2593159.pdf
    • https://cdn-cms.f-static.net/uploads/4387424/normal_5f8d855f7fa38.pdf
    • https://zemuxarasojutin.weebly.com/uploads/1/3/4/3/134374283/709027.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fulosobezur/legudamebelajenojapifapu.pdf
    • https://s3.amazonaws.com/somamere/whited_sepulchre_definition.pdf
    • https://uploads.strikinglycdn.com/files/2e6292a9-f0b1-4b71-89a2-bd8b12fa9f68/when_setting_direct_labor_standards.pdf
    • https://uploads.strikinglycdn.com/files/3f07bcc3-4e50-4dc2-9deb-6ed0ce191b17/64722622058.pdf
    • https://s3.amazonaws.com/wiwamoxamo/xoruwiropozubi.pdf
    • https://uploads.strikinglycdn.com/files/038cfae1-ebd9-469b-afe2-f2d94371f7b1/airspace_classification_icao.pdf
    • https://uploads.strikinglycdn.com/files/fd06d7a2-d782-41c1-83da-f2d128c6b0a6/2002_buick_rendezvous_repair_manual.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_off0000778f.bin
78384a35b2d090db987f803398f3ebe54765b458f5bddc56c10ac5b4a8336176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778F 5332 bytes
font_01_sfnt_off000089a3.bin
3926a92e07576f133f32e80fabaa51edd60b602a0d07970cc384fa1843a6bdb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A3 10744 bytes

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