Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f653ca57fc01272…

MALICIOUS

PDF

37.2 KB Created: 2020-10-11 12:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 7f043152fdbccb7972a3d3fd1aa5061b SHA-1: bbb1f02c4c0664d5f5a6516361a8ea8e35c7e93c SHA-256: 4f653ca57fc01272add6a01879dcb7d3aeb448ab5af41445c8569407fc39a8cf
184 Risk Score

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=nagant+revolver+parts In PDF document text
    • http://files.thevisualnarrative.com/uploads/1/3/1/4/131407086/5196340.pdfIn PDF document text
    • http://files.proamrefs.com/uploads/1/3/1/4/131405977/5129773.pdfIn PDF document text
    • http://files.froumlaw.com/uploads/1/3/1/3/131384516/lujujigavajajo_mipulojisifo_gawazo_zonog.pdfIn PDF document text
    • http://files.launcestoncarols.com/uploads/1/3/1/0/131070374/7bf34bcb24bda86.pdfIn PDF document text
    • https://site-1038756.mozfiles.com/files/1038756/rureresowipiwede.pdfIn PDF document text
    • https://site-1038604.mozfiles.com/files/1038604/31249442177.pdfIn PDF document text
    • https://site-1036679.mozfiles.com/files/1036679/28362480502.pdfIn PDF document text
    • https://site-1040777.mozfiles.com/files/1040777/sutesigivewiguz.pdfIn PDF document text
    • http://mepibil.emilycaffery.com/uploads/1/3/0/8/130874161/difesetetuxop_govujakijuri_jozumug_bepugotu.pdfIn PDF document text
    • http://files.helloshannonlee.com/uploads/1/3/1/4/131453969/61c350810.pdfIn PDF document text
    • http://files.micromemphis.com/uploads/1/3/1/4/131453220/zojimogebagola-jewubes-ligake-poxomujor.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/a0213af4-583e-499c-ae23-22e8469ab7c6/nerutokewozutiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd4e9c10-2c37-4d00-8789-cae335dcec23/70530312515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7926cc23-b34b-458f-ba89-5cc11169d886/meteguxejizezimeso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/694f4a57-d927-40d5-b047-f86fc14a2c8a/27463720790.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_off0000519f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x519F 5016 bytes
SHA-256: 24032fbd115aaf0de551f09dae413a85f40865d9f5b87325ac3d47f612af01b4
font_01_sfnt_off000062c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C8 10612 bytes
SHA-256: 0a5932e8aaaead3dec12d76b28e6ee21ec364eeb8b04f4726da7fdef479a3d94

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