Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c94b39d9cd402f…

MALICIOUS

PDF

41.1 KB Created: 2020-11-05 03:36:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 548e3cd21bd0398e0ff0667976b921c6 SHA-1: deb484b0954dd5da5950e27673b6bb0e5a88b4b3 SHA-256: b6c94b39d9cd402fc846614dbea25fea39c699d891b1214adc3a4744c34228b4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, identified as a link farm, directing users to potentially malicious infrastructure. One prominent URL, 'https://cctraff.ru/strik?keyword=state+of+ct+2019+tax+calculator', is flagged as a malicious redirector. The document body, though partially corrupted, also contains this URL and other links, suggesting a lure to external content. The ML classifier strongly indicated maliciousness.

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://cctraff.ru/strik?keyword=state+of+ct+2019+tax+calculator In PDF document text
    • https://cdn-cms.f-static.net/uploads/4428334/normal_5fa11f46e1e6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_5f9a3c0aee4c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f879cec758e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5f9816d3d47ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426686/normal_5fa182e9004a9.pdfIn PDF document text
    • https://tenanetudoji.weebly.com/uploads/1/3/4/2/134266315/jasirufedojipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422659/normal_5f99aab9c47e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_5f89c1fe4b942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375698/normal_5f90f9d3aaf60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5f89c51abb093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410702/normal_5f9f85c249d83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5f8aeacea37f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381730/normal_5f8faed07871d.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/kijelopazekune/cebuano_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/cracking_codes_with_python.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_off000060c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C5 5352 bytes
SHA-256: 2259f147cb890170c19c1e33f6321a76c489cbbad3729e29122cb563eb6f68c6
font_01_sfnt_off00007311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7311 10784 bytes
SHA-256: 8c6b5817601573122aef55987264cb9a4814b7f55b08203abd8d3c4c396e6428

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