Malicious PDF — malware analysis report

Static analysis result for SHA-256 5356bf99b1121748…

MALICIOUS

PDF

79.9 KB Created: 2020-10-29 09:33:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0ab13f327f2da21c529f1a46283796f1 SHA-1: 37580cd3e868346f57dc7a3fac4f5328bfa04ba3 SHA-256: 5356bf99b1121748513a1f274f3ffe78bded73bef756d4099d9fe5a06cfe2fb2
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirect to malicious infrastructure. The primary malicious URL identified is https://cctraff.ru/123?keyword=paring+knife+definition, which is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is designed to lead users to harmful sites.

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/123?keyword=paring+knife+definition In PDF document text
    • https://tojaluteder.weebly.com/uploads/1/3/4/3/134384479/6414066.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/suxamimewol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f8810c49ac16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408584/normal_5f924aa6bb0c8.pdfIn PDF document text
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/gaxukegudo-jexipageburujof.pdfIn PDF document text
    • https://tojaluteder.weebly.com/uploads/1/3/4/3/134384479/5672351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377647/normal_5f8e4939075d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_5f90d2d22143b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414342/normal_5f952e7561c94.pdfIn PDF document text
    • https://bizavurodetilu.weebly.com/uploads/1/3/4/3/134391156/705313.pdfIn PDF document text
    • https://zipazoraxegav.weebly.com/uploads/1/3/4/3/134325660/79368b14e1.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/01c1b3c5bd51c93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392472/normal_5f9230a5745ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_5f96322bd904b.pdfIn PDF document text
    • https://kilejotiwig.weebly.com/uploads/1/3/1/4/131406519/9661115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f870bbc02871.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3449/9493/files/jubun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3295/1975/files/wunidojum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7806/0698/files/41175603488.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4197/2646/files/whirlpool_silent_partner_i_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4998/3905/files/jivosexemomalopilu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5124/5464/files/11674100257.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_off0000d43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43C 11724 bytes
SHA-256: c691c060954e09eaacaab0fd125f02383078f9d6aed1b8e5515b5f534d8dddac
font_01_sfnt_off0000fb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 4932 bytes
SHA-256: d151954f8ce2a4fc885b1d77b0a22091f1e24ccba1eee9537f97ab6a403310e6
font_02_sfnt_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 11096 bytes
SHA-256: 919bd3f700f2e3a0457dca8c60d875fd3bb2ee897e5b2cd50f1ac7d9e0c23e6a