Malicious PDF — malware analysis report

Static analysis result for SHA-256 a468cec6fc409d83…

MALICIOUS

PDF

50.9 KB Created: 2020-09-29 21:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a25ab3e7bc0dc99f74c2cd037bc2eb42 SHA-1: a91974723e4ebb240cfe936d422653fee08c3835 SHA-256: a468cec6fc409d83afd19b691b90d814040a9be102a71487c1cd023403b57ebf
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=welding+machine+specification+pdf In PDF document text
    • http://rirama.bhlexvolunteers.com/uploads/1/3/1/4/131455463/4209827.pdfIn PDF document text
    • http://telizubuw.vibewithshannon.com/uploads/1/3/1/4/131453170/1ab5a9ea.pdfIn PDF document text
    • http://files.journey2innerpeace.com/uploads/1/3/0/7/130739684/30192.pdfIn PDF document text
    • http://retifomu.funonwater.net/uploads/1/3/2/3/132303189/8a948d56.pdfIn PDF document text
    • http://gulax.arthealswarwounds.com/uploads/1/3/1/4/131453048/57bc29571dcfba5.pdfIn PDF document text
    • http://files.itistheend.org/uploads/1/3/1/4/131452950/dikuvefuburexifizupo.pdfIn PDF document text
    • http://files.rosecityhealth.com/uploads/1/3/2/6/132681772/6406650.pdfIn PDF document text
    • http://dunomagu.rachaeldinsmoreart.com/uploads/1/3/0/8/130813366/899c070f39a.pdfIn PDF document text
    • http://kibulu.missbilovsky.com/uploads/1/3/1/4/131408024/1667618.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/93a63fc9-f22e-4ea2-a2a8-d11796558420/sezududosim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1f03528-2f2c-47bd-b837-fd8a660de709/36688641547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5684164-2d0b-4a0c-a64b-65949e5a1f57/90494850412.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7563/2285/files/soramobamud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6495/0945/files/7655233043.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/9510/0311/files/51199563051.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8489/0790/files/treatment_low_back_pain.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/36725214957.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_off000088bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88BD 5488 bytes
SHA-256: 591eb03c7db7c7542b64280be7c205b5af585cebbb583566db11cfd3048ddbe8
font_01_sfnt_off00009b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B52 10240 bytes
SHA-256: 5365dbe560f3a7187ef4d2c4c7c55a5cb09c20d546d56fae6cf37ccbccd13823

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