Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae634eb2a707ed3…

MALICIOUS

PDF

40.8 KB Created: 2020-11-08 17:28:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab5d95917d1bb754a9b89f4bb9b36760 SHA-1: 5896ea615d20a71740e7d2926dc3ef6368d4f973 SHA-256: 5ae634eb2a707ed3e5c9a33817b6fc3a459e7c2f03a644ba98b0ff768efeefc4
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a large number of external links, many pointing to PDF files hosted on file-sharing services. The primary URL, 'https://trafffi.ru/123?keyword=non+action+verbs+quiz', suggests a lure to a quiz page, likely for phishing or malware distribution. The presence of numerous PDF links indicates a potential SEO link farm or a method to obscure the ultimate destination.

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=non+action+verbs+quiz
    • https://nabesoke.weebly.com/uploads/1/3/4/0/134042749/vogax.pdf
    • https://xexegetogud.weebly.com/uploads/1/3/4/3/134375989/8136099.pdf
    • https://govenovu.weebly.com/uploads/1/3/4/7/134701044/xesokuwuvile_zoxapalowapozim_tixat.pdf
    • https://cdn-cms.f-static.net/uploads/4391015/normal_5f9c7051f1e9b.pdf
    • https://sakifawabepufa.weebly.com/uploads/1/3/4/4/134466371/7166765.pdf
    • https://gokisixoxi.weebly.com/uploads/1/3/4/1/134108612/771715.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e62907dd-1ac6-41cd-ada5-8d2b76354a23/94844753200.pdf
    • https://uploads.strikinglycdn.com/files/bb69f996-70f7-44d5-b271-7b279f1c2a42/tulonolevutisagixifa.pdf
    • https://uploads.strikinglycdn.com/files/9924c941-4b3f-4de7-a604-cfb37bad8cc2/bolsheviks_definition_1917.pdf
    • https://uploads.strikinglycdn.com/files/9b21186f-c86d-41f7-a629-7996adbf3f44/66548934619.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_off00005dea.bin
930f4409536419a5ba4890ac33576274dbe837b411f10b4776bcb6d0393a440a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEA 5108 bytes
font_01_sfnt_off00006f6e.bin
131cb891b77ecc4e109d050c74703a9f76c8b38033d4fab500eaf1e739d53635		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6E 11488 bytes

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