Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b2e1c2677da685…

MALICIOUS

PDF

44.0 KB Created: 2020-11-09 08:35:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bc8666cafbddef494605148bb56c1171 SHA-1: 3899f657b5a7b5cc136f582edc31c1c5aa71582e SHA-256: b0b2e1c2677da685666ef7ca855b9953d3906e54aa4b174bd0662ecf06ef7c7c
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains a large number of external links, many pointing to disposable hosting. The primary URL `https://trafficel.ru/123?keyword=human+skeleton+pathfinder` suggests a potential SEO manipulation or phishing lure. The embedded link farm indicates an attempt to distribute traffic across numerous URLs, likely to obscure malicious activity or to serve as a landing page for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?keyword=human+skeleton+pathfinder PDF link annotation
    • https://tilinonulubun.weebly.com/uploads/1/3/4/6/134614078/c1cf6e98f1b.pdfIn PDF document text
    • https://katolafafesol.weebly.com/uploads/1/3/4/4/134479470/xarepuxuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5f8ad03d957c3.pdfIn PDF document text
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/e6b139a6f594562.pdfIn PDF document text
    • https://nevonanopovew.weebly.com/uploads/1/3/4/3/134335048/140047.pdfIn PDF document text
    • https://xifamosavujefiv.weebly.com/uploads/1/3/4/4/134457952/2967d32cd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373779/normal_5f8bbf46505ce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xoxaneral/english_grammar_narration_in_hindi_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/vipajatitaxetiz.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/artaud_poesie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d4235ef-ebf1-49e0-8caa-c9de2a50d3ec/lezoxamana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ce23827-e82f-4af0-b12c-d1bcefcaec7c/xajisugolovudip.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F63 5188 bytes
SHA-256: d9933ddc38f25e1c1f76c270b64c7f636796f846b6e739fda95af1e384edff37
font_01_sfnt_off000070cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70CF 10920 bytes
SHA-256: 89c7e07788f14267ee063bd538771ca58d15ccd4c38803f670607040aa8672fc
font_02_sfnt_off00009569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9569 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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