Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85f6f1d51550b25…

MALICIOUS

PDF

220.7 KB Created: 2020-11-14 01:58:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ce78899020713e6751c0b4439ed98b96 SHA-1: 1d56409bb3b637df7f7ea471d8b618a828d3506a SHA-256: a85f6f1d51550b2573c6e07c8e445f1a81de429051b728b139c77d0dff1872b5
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'traffking.ru'. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, appears to be a lure for a free PDF download, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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?utm_term=afterburn+aftershock+pdf+gratuit In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369514/normal_5f8e5d92110c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_5f9048db9eae3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465264/normal_5faed8ad36b59.pdfIn PDF document text
    • https://netulomite.weebly.com/uploads/1/3/2/8/132814473/katenov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383147/normal_5fa7e9cb302a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455399/normal_5faa3fe0ee258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_5faf11ee354e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416332/normal_5f969a7145b78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386607/normal_5f94caf45a4f5.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/nezanurugega/pufesulowovaxov.pdfIn PDF document text
    • https://s3.amazonaws.com/tagorarib/33354058663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b35099f-1e89-46eb-96ca-c08094e2cc81/tassajara_bread_book_sourdough_recipe.pdfIn PDF document text
    • https://s3.amazonaws.com/zojizu/80814283723.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_off0003209e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3209E 2968 bytes
SHA-256: 1c91280eb79ffdc858b6ecd2b9b1b9121e398c569f5702dd47e27479ee3b0056
font_01_sfnt_off00032b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32B44 5576 bytes
SHA-256: 3c17bc357811709434d371cb0aefc94aee429f031124212cf3ea0cc42c11793f
font_02_sfnt_off00033e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33E37 11596 bytes
SHA-256: 3b84359d0310e49439abae9c3f0bbfa7e157e7842fd3d36eb99af24ebddfeeaf

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