Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18304b5008aaa06…

MALICIOUS

PDF

45.3 KB Created: 2020-11-09 12:48:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 95bffa5ef51f88d73ddafa946e62f17e SHA-1: 7c3c7e5bfd84d9a98ea18b9f44bfcff7a2a08d3b SHA-256: a18304b5008aaa06f6956930809ffad9ce74e0c09ad6265eb0ece3d0c64bded2
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://traffking.ru/aws?keyword=what+does+nwedi+stand+for', suggesting a lure to a malicious site. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and the 'PDF_SEO_LINK_FARM' heuristic indicates the PDF is part of a larger link farm designed to distribute malicious content.

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 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.
  • 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://traffking.ru/aws?keyword=what+does+nwedi+stand+for In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372967/normal_5fa72e946d918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5f90545fe2918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387702/normal_5f97251855ff9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_5f96b8a269c83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_5fa33725731ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422136/normal_5fa48438eaa45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_5f894a1f70722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377414/normal_5f9a09caea253.pdfIn PDF document text
    • https://muzokive.weebly.com/uploads/1/3/4/4/134498707/tebitarejofo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wilugugo/nuzebupife.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/knightfall_netflix_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/essentials_of_teaching_academic_vocabulary.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_off000072d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72D9 5068 bytes
SHA-256: 19277c75f32357f7056f1fa4aa4db7cd14b79c352da65ec5c9db6e907f522de4
font_01_sfnt_off00008429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8429 10760 bytes
SHA-256: 4db823f837b1fb172f318a8dafa3b0e0a7981c88bcfb58b55c8a3f1e6990afd7

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