Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e43ce6a98c6d708…

MALICIOUS

PDF

54.5 KB Created: 2020-10-04 00:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1e5685499a17423886278331bbeeda86 SHA-1: f5f5b93d57dd873a7dbd6344a9d821ba80abfca5 SHA-256: 4e43ce6a98c6d7089b088e27a1f6ee44534fc1e5bb23529adffdc4aa539c5373
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one identified as a known malicious redirector. The heuristic firings indicate this PDF is part of a link farm, likely designed to manipulate search engine results or distribute malware. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it is intended for malicious redirection.

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://ggtraff.ru/pify?keyword=nationale+test+engelsk+7 In PDF document text
    • http://maravifo.sassyarabia.com/uploads/1/3/0/8/130874426/2567911.pdfIn PDF document text
    • http://files.farmacybotanical.com/uploads/1/3/2/3/132302973/xutitogesafa-lixoreriberexik-larowuwonubola.pdfIn PDF document text
    • http://bosog.wildago.com/uploads/1/3/1/6/131607163/cdd36.pdfIn PDF document text
    • http://files.inglenooksoaps.com/uploads/1/3/1/4/131453182/kolepa.pdfIn PDF document text
    • http://files.charlaphysed.com/uploads/1/3/1/4/131406248/1288692.pdfIn PDF document text
    • http://files.urinalvinyl.com/uploads/1/3/0/8/130874610/zavivo.pdfIn PDF document text
    • http://files.vetsaccessllc.net/uploads/1/3/1/4/131483279/1446453.pdfIn PDF document text
    • http://sizojaj.storybookprincesspartiesny.com/uploads/1/3/0/8/130873826/9419307.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/ff0c70bb-85d4-4c6f-ad23-c5509cb3bb68/93496430420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20a1696e-bbac-49c4-bc5b-e0e01dbff351/45051991766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c74d9cc-1e27-48fb-8205-9a43be9ac338/ruxigijififemafazixupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d6c98ee-c6f0-46fa-81cb-b8c50fd63131/melibipojososo.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_off00009809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9809 4872 bytes
SHA-256: b9fb42361295575101da27c542201e3f9edfa0a1d5958d7b7f34d708f4f44b17
font_01_sfnt_off0000a8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8C1 10780 bytes
SHA-256: 14f5d51788dbd4cda1b9ea621f123f18b8811389f5c80cf877e421271a1177c8

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