Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b651bfa6fd4b37…

MALICIOUS

PDF

41.5 KB Created: 2020-10-28 06:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b9f026541b147a84f3efc635ef321bf5 SHA-1: 17c470b7c512d485071c95b2c1378c5ef009c156 SHA-256: c4b651bfa6fd4b3771ab3db8fd8bfde0713920380003ae96e1fec6fcbe10c9fd
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at https://ggtraff.ru/strik?keyword=letter+of+commitment+grant. The document body, though obfuscated, also contains this URL, suggesting an attempt to direct users to malicious content. The ML classifier strongly supports the malicious verdict.

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://ggtraff.ru/strik?keyword=letter+of+commitment+grant In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393019/normal_5f91faa8d73dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_5f9486cb203d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389080/normal_5f933d0875088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5f90b7de4a8fb.pdfIn PDF document text
    • https://wuwuleli.weebly.com/uploads/1/3/1/3/131398564/5031792.pdfIn PDF document text
    • https://sabovewedasujak.weebly.com/uploads/1/3/4/4/134493104/6ba6466310c538f.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/bajato_zavomojugadep_kizofajufem.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/woratopidediwaxewu.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/tetazino/35781925557.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/cofactor_of_a_2x2_matrix.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/dujenisuwufonolemob.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/safutozemimejituzidofara.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/22497587371.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/tufuralevevu.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/79877427963.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/sasijixis.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/comment_fusionner_deux_fichiers_adobe_reader.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_off000066b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66B3 4932 bytes
SHA-256: 36975917fc9332bdb765c3923c040ac2e40b101262b99fad790c6dfc1d0df77e
font_01_sfnt_off0000776b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x776B 9908 bytes
SHA-256: 20e6b5360ebcfc2410d5a386236e3c1e31229cb174db3704b16f80387ab6a5ff

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