Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b79b002d3ea9f3…

MALICIOUS

PDF

52.0 KB Created: 2020-11-04 14:34:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a9ea2cd75c3adbdae600402dcf89907b SHA-1: b4ae3e7784411fa17724fbdbe6151b0696f590ad SHA-256: b9b79b002d3ea9f3a666e82b5db892c48a0f2758bd527eee5b763cb26b06e511
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The primary malicious URL identified is https://cctraff.ru/strik?keyword=wormtown+brewery+beer+advocate, which is flagged as a malicious redirector. This suggests the document is designed to lure users to malicious sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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 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.
  • 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://cctraff.ru/strik?keyword=wormtown+brewery+beer+advocate In PDF document text
    • https://lawaxiwutaf.weebly.com/uploads/1/3/4/3/134356413/jumugiwutif.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/2823319.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/0e81a5aa.pdfIn PDF document text
    • https://fulojozizarotuv.weebly.com/uploads/1/3/4/3/134318677/berasagumiw_gatiwurame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413240/normal_5f973a16d5748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378836/normal_5f965f1a8d4c9.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/4472734.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/4e252cc9-ebef-478e-a238-58d7a4a65769/mesikobavigavovowikugido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b187953f-2f4e-4df5-940b-3f6dbb5fac8e/70040952740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5708edd-b50d-405e-8dd1-300409958ca2/zotegepofube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/336ce6b0-37a1-433c-850e-afbc08f5bc08/kipejotozolinovovisefijep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1ed3ca6-ac90-4d18-ada8-1ed7be8ba0ab/28970696298.pdfIn PDF document text
    • https://s3.amazonaws.com/tifemuma/download_imo_apk_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f42ce210-3cd2-4c94-946d-bdd5dce1a155/matapemakawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e1e393c-0fd3-415a-b3e4-65d43cce37dc/differential_equations_with_matlab_hunt_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c976a56f-c1c4-4801-a295-2129fb90f5f3/biology_objective_questions_and_answers_for_competitive_exams.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_off000083c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83C5 5280 bytes
SHA-256: 46cf6cfdde0f6882bc0aa9ae255f5e8fdfb023b2ac98cd740af1978b1048fe10
font_01_sfnt_off000095bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95BF 13744 bytes
SHA-256: 3a6a96464a0b44e7c9e939581d957817a2b8d610fdd41785a810e16c85529a1c

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