Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8bcffd3c141ebb9…

MALICIOUS

PDF

64.1 KB Created: 2020-10-14 23:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0b40b7cf96e64335500701eaabd7523d SHA-1: b24b661bf7013ba27bbf98225770955d2bb417f5 SHA-256: c8bcffd3c141ebb98160223f4f71bd7e52bac3087b5a0769b71c4c96d7e49b24
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically 'ggtraff.ru'. The ML classifier strongly indicates maliciousness, and the document structure suggests it's part of a link farm designed to obscure the final destination. The primary intent appears to be directing users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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/pify?keyword=teoria+francesa+del+acto+juridico+pdf In PDF document text
    • https://site-1040256.mozfiles.com/files/1040256/82410208324.pdfIn PDF document text
    • https://site-1039787.mozfiles.com/files/1039787/53504353104.pdfIn PDF document text
    • https://site-1040974.mozfiles.com/files/1040974/16020930034.pdfIn PDF document text
    • https://site-1041405.mozfiles.com/files/1041405/dolopasulumefebalu.pdfIn PDF document text
    • https://site-1041608.mozfiles.com/files/1041608/jalapaxoketelinavap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f871c452289f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f870fb51a94a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f875924c79ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f870c9be9686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f8755702c368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_5f87526ad48d3.pdfIn PDF document text
    • https://site-1040896.mozfiles.com/files/1040896/patexobini.pdfIn PDF document text
    • https://site-1043130.mozfiles.com/files/1043130/30177396540.pdfIn PDF document text
    • https://site-1044113.mozfiles.com/files/1044113/54116853835.pdfIn PDF document text
    • https://site-1044313.mozfiles.com/files/1044313/zasovodobelurimivi.pdfIn PDF document text
    • https://site-1041861.mozfiles.com/files/1041861/93844133923.pdfIn PDF document text
    • https://site-1036807.mozfiles.com/files/1036807/89043862499.pdfIn PDF document text
    • https://site-1038565.mozfiles.com/files/1038565/46866290954.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7D 5172 bytes
SHA-256: c2679017f06c6472ee6c525d08825dbda08d1e4e2f414fc5bd5a2c4135e08093
font_01_sfnt_off0000cd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD24 11264 bytes
SHA-256: f420d3a772f890f5018e911237861cd10957057416da6b2ec6889e60246fb475

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