Malicious PDF — malware analysis report

Static analysis result for SHA-256 037cbba32902b78f…

MALICIOUS

PDF

66.4 KB Created: 2020-11-06 08:13:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7fc1294fbcb47deb878156f162d5c01d SHA-1: 1d6f122d826df916522c4af9ddb347719c41c79c SHA-256: 037cbba32902b78ffb37511e970a4290c9239e68b16f64d0968d2984d6d1a957
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by an ML classifier as malicious and contains a large number of external links, many of which are likely part of an SEO link farm. One of the primary URLs extracted, 'https://trafffe.ru/123?keyword=dead+rising+2+survivors+guide', suggests a lure related to a video game guide. The presence of numerous external links, including one pointing to a potentially benign file hosting service, indicates a pattern of distributing content or redirecting users to other sites.

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://trafffe.ru/123?keyword=dead+rising+2+survivors+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375356/normal_5f937d166b4e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381101/normal_5fa4bc2aef369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373779/normal_5f88ebb2ce380.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421058/normal_5f9ad6f25ffe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465392/normal_5fa4ae5c166db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379615/normal_5f8c2b8374158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393197/normal_5f9c1451d9c3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382407/normal_5f8c20fc72901.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/1532bd38-bc40-479e-a9d8-c00e7202d110/legends_of_the_guardians_the_owls_of_gahoole_123movies.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/12902736272.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/defiance_2050_ego_leveling_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/7589/3924/files/kinds_of_descriptive_text.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0508/1589/3677/files/kapalama_satellite_city_hall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ace7cf79-f43f-4f89-87f8-3713f7f36866/pudamigaju.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_off0000c622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC622 5152 bytes
SHA-256: b67830cc53f0d359540634ce00f2eace0fd39c0317a9e704a8b23d0b6e0daa87
font_01_sfnt_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 10768 bytes
SHA-256: d05f76ad3376d6fd17ec072abff1c4352d06f47d295ae9ed6c09b780223f41d4

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