Malicious PDF — malware analysis report

Static analysis result for SHA-256 436840af70d8a387…

MALICIOUS

PDF

43.4 KB Created: 2020-09-30 12:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 5228e4170f316d76a3dd20b8fe81257b SHA-1: 6f7c6b8dd8a1a434236b909f7ee532de8a8b4f61 SHA-256: 436840af70d8a387332b27bb5035e4adadc0973040ac85e08734b75f75a9ddc3
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=les+blagues+de+tonton+liste+pdf In PDF document text
    • http://files.hopkintonhistory.org/uploads/1/3/0/8/130873945/zirab-ketivato.pdfIn PDF document text
    • http://nuxojuba.convergencearchitecture.com/uploads/1/3/1/3/131379732/7043234.pdfIn PDF document text
    • http://nitozor.akidsplace-huntingburg.org/uploads/1/3/1/6/131636922/wureroduvi.pdfIn PDF document text
    • https://site-1036671.mozfiles.com/files/1036671/76914308582.pdfIn PDF document text
    • https://site-1036911.mozfiles.com/files/1036911/91231953560.pdfIn PDF document text
    • https://site-1037203.mozfiles.com/files/1037203/xelijozanixowopafoxak.pdfIn PDF document text
    • https://site-1036743.mozfiles.com/files/1036743/9577174205.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/9ac4becb-09b4-4cc1-9568-1f9948b620da/96069544646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b326bab-739d-4c4f-a1af-59dde4a9d256/1421458183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3119901d-de8b-4762-8f22-ff9ce5578496/nezofevoxugijoratijojam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01f41645-99c2-4b94-86eb-b01b260d2177/45966824584.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86c03370-c0d9-4fde-9452-acd552697b58/23954124201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93fec3f3-a566-4095-8b93-a533dcf02917/xexetij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f84f12d1-c19d-4629-b177-7340051dc529/63093024574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca75b7c7-b970-4593-bc0a-eaa9bb73e875/gipog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd441461-fb8d-4603-8d42-011220743d58/11356281208.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_off0000687e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x687E 5196 bytes
SHA-256: 98491c961f8047eaadd2b6c274d56d5dc317f8809cddefdf6b8dcb9ef2fc3a84
font_01_sfnt_off00007a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3D 12496 bytes
SHA-256: e9c1789683e3b63e7bf87ea401c19b34db48b222297e6cf1ae3829651b456e01

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