Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1ca79578092629…

MALICIOUS

PDF

39.8 KB Created: 2020-09-30 01:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 184a9a4130f2a023d3917d6381520114 SHA-1: fff446c920d08ad72a07b8a099561304a28ed4c2 SHA-256: 4b1ca795780926298d81f77c1712bab19192ab48fc0d431c2edcadda0b162236
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://ggtraff.ru/strik?keyword=critical+theory+pdf+tyson In PDF document text
    • http://gogudu.clintonwhiting.com/uploads/1/3/1/4/131406656/xatoj.pdfIn PDF document text
    • http://ripeme.yourfloridahealthguide.com/uploads/1/3/1/1/131163953/zenewujap.pdfIn PDF document text
    • http://files.printingminocqua.com/uploads/1/3/1/4/131452836/wosekunosumazu.pdfIn PDF document text
    • https://site-1037160.mozfiles.com/files/1037160/80604526799.pdfIn PDF document text
    • https://site-1037837.mozfiles.com/files/1037837/40474575041.pdfIn PDF document text
    • https://site-1037125.mozfiles.com/files/1037125/89398182600.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://cdn.shopify.com/s/files/1/0437/6153/3085/files/mazawugus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/54978289568.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/0895/0176/files/fuzubijerosidajosomok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd935b75-e798-4c2d-b584-26efc23b3ef3/86614503100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43e3e0c4-ecac-44cf-ae33-ae537515ab21/gibopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a54fd9-0b9d-4e5d-9110-814b57c0657b/titimolaxurulun.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_off00004d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D4C 5156 bytes
SHA-256: 29cad84c371ba98804784aa9fc872f312292288edc35827c623d2b2394e0f740
font_01_sfnt_off00005ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED1 11320 bytes
SHA-256: c2142d271523ec01473ed58253250095f2a19fb963dfce597394b65e0262ea5c
font_02_sfnt_off00008454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8454 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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