Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8dc4e47d39c552…

MALICIOUS

PDF

38.8 KB Created: 2020-10-07 04:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 500794a7a2f6a613fe91647429063311 SHA-1: 8897391a8d801ec74d53fe99233c1f2b4a0fc5dc SHA-256: 4f8dc4e47d39c55200808c26e5771ceed902d97222f9984a37efc2eeb07ba3b0
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=ethiopia+abyssinia+law+pdf In PDF document text
    • http://files.coloradosnakes.com/uploads/1/3/1/4/131406253/1284716.pdfIn PDF document text
    • http://files.wcsea.us/uploads/1/3/1/4/131454754/fajiku-rutufifojijiwe-bawafopimezuter-povopogowute.pdfIn PDF document text
    • http://files.stpetersoc.com/uploads/1/3/2/7/132712483/solopuxi.pdfIn PDF document text
    • http://files.holt-art.com/uploads/1/3/0/7/130775934/rulidozazen.pdfIn PDF document text
    • http://files.horatiomethodist.com/uploads/1/3/1/1/131164174/dfd097d87f7e34.pdfIn PDF document text
    • http://rakutuba.dunesdreams.com/uploads/1/3/2/6/132695388/kedixofamizex.pdfIn PDF document text
    • http://files.uusandiego.org/uploads/1/3/1/3/131378993/471e2cf0d2.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/9badcedc-9d06-4656-ad08-0bc73250652a/roduzegadutofesawoneb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dd67c14-48c2-45f1-9164-2a9886738b8d/87845253268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e0c50cc-7534-46cd-ae33-18f8053cb7ba/xosutozor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1402/8444/files/54317991125.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0325/1368/files/verbo_poder_en_past_participle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3337/4119/files/ge_downdraft_cooktop_grease_filter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3850/7169/files/dokijuv.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_off0000598b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x598B 5324 bytes
SHA-256: 3105f43260bfd16631393ec3fae8ac078edd4e3a0c0451e913bdd472066cc64a
font_01_sfnt_off00006bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB8 10208 bytes
SHA-256: 67ddea184ae1a2994cd512d0c1f1f995ae7b7aaf731769e1640a000ba7f37975

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