Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd8b4c2c4ef432e…

MALICIOUS

PDF

40.5 KB Created: 2020-11-05 04:49:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 14f3614c1008085dc644c59fa2057a9c SHA-1: df40fd110e3d1e7f1476cde1a391229ad388e848 SHA-256: 6bd8b4c2c4ef432e55b68a0766bdf0f7e985427644cf41bd1492ce5abcc4f4fe
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body and embedded links suggest a link farm or SEO poisoning tactic to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/123?keyword=kwal+paint+colors+search+exterior In PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/roruj-fegedevovelere-zexomojikazi-rewubujelem.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/delatel_jujugumufir_gubodivulewisen_gofet.pdfIn PDF document text
    • https://fuloremazugad.weebly.com/uploads/1/3/4/3/134356453/melofirofakesazurati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_5fa10ceb09b89.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/3713056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379482/normal_5f8e1800b243a.pdfIn PDF document text
    • https://papokerudinex.weebly.com/uploads/1/3/4/3/134310480/zidesebapobivok-tevinemolamazi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1caaf7ec-5feb-450e-b19f-b63b13b12f86/87224861770.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/6344/1077/files/40047701398.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8691/2413/files/upload_to_google_slides.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/cognitive_behavioral_therapy_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec847a1-1798-4df9-b03c-7ad16669a450/witelubuxazezimekawibas.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E47 5148 bytes
SHA-256: 29193fd010b8165303d80ebb1b2fc26d79d5349ce4366fe03c0cd0011a143a22
font_01_sfnt_off00006fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD8 10868 bytes
SHA-256: e48fe0fac12ac9490f33eb6d4b00493adbe9620fef8db8e04c52e2a04c0cd28c

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