Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8198208f1d99bda…

MALICIOUS

PDF

49.9 KB Created: 2020-10-08 13:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 439e8fe934eda22b51c8687cbd156842 SHA-1: 9576cd0fa2d52925de1fb84181757d38b29f7129 SHA-256: f8198208f1d99bdaff12eea412d7e599c1ed3e52f91f1b7343d24a67a9c3effa
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirect to malicious infrastructure. The primary malicious URL identified is cctraff.ru, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains a reference to the malicious URL, suggesting an attempt to disguise malicious activity as academic content.

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=materi+kuliah+akuntansi+keperilakuan+pdf In PDF document text
    • http://files.foodwebfarms.com/uploads/1/3/0/9/130969061/6883247.pdfIn PDF document text
    • http://files.firstchristianvinton.org/uploads/1/3/1/4/131438839/2f52637a3.pdfIn PDF document text
    • http://files.jaylowe.com/uploads/1/3/1/6/131606876/disefozunagi-buxogasu-fajugiga.pdfIn PDF document text
    • http://files.mechanismus.net/uploads/1/3/0/7/130775539/9b703359.pdfIn PDF document text
    • http://vosige.yensawerth.com/uploads/1/3/1/4/131483128/b616dd3195.pdfIn PDF document text
    • http://files.eloquentslt.com/uploads/1/3/0/8/130874393/a744aa4e3fc.pdfIn PDF document text
    • http://files.kathleenmckennahewtson.com/uploads/1/3/1/1/131164063/1032863.pdfIn PDF document text
    • http://files.arncredentialing.com/uploads/1/3/1/4/131407665/4599719.pdfIn PDF document text
    • http://pegisebo.wcreed.com/uploads/1/3/0/7/130740433/lixedumalowetod.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/c434e496-1786-4039-8e29-3742ee661bb8/fafawewiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e67689a-d364-4003-a5db-30c8c15f2ef2/31327894704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dfd2f1e-27fb-40dd-b310-e5895bd945e4/sepevegaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f72f48d3-b272-4dec-8f50-1f25e6e8221f/nekizofiwakepodoxusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e929c90-5105-47a0-9794-72655d36cb91/59411186238.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_off00007dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DCD 5196 bytes
SHA-256: 4747fd719a3ee908b4bc5c8ca0592dc506df8a7a38814fee4ec4b4fc8f3e2e32
font_01_sfnt_off00008f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F75 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00009802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9802 9960 bytes
SHA-256: 19cc85754caafe5336c9c72474ad09ce7d7e3ab7584de16cd7b1ecf34fdf3dbd

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