Malicious PDF — malware analysis report

Static analysis result for SHA-256 7329a9a16ef721fe…

MALICIOUS

PDF

61.3 KB Created: 2020-11-04 08:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8376bd9e49efcf30dfd8ae25cc43bc5a SHA-1: 1c009efe3ecd5aefb6eb7c3d58229d41b27b71c3 SHA-256: 7329a9a16ef721fe8741198e8dfe14cf646b0b128d5ef30b3c1b6c840831686e
94 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 'https://ttraff.ru/123?keyword=hierarchy+of+needs+maslow+s'. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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://ttraff.ru/123?keyword=hierarchy+of+needs+maslow+s
    • https://cdn-cms.f-static.net/uploads/4410217/normal_5f938f8af14a8.pdf
    • https://cdn-cms.f-static.net/uploads/4378605/normal_5f920546585f0.pdf
    • https://cdn-cms.f-static.net/uploads/4410016/normal_5f9f33af05630.pdf
    • https://cdn-cms.f-static.net/uploads/4392199/normal_5f9bcdd52eea3.pdf
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/xupabozividefirupax.pdf
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/foxoxujiroluzi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/firigugixujotov/learning_agility_assessment_korn_ferry.pdf
    • https://s3.amazonaws.com/sugaguxagu/esl_classroom_rules.pdf
    • https://s3.amazonaws.com/dorulusof/97734928482.pdf
    • https://s3.amazonaws.com/dudurat/93865541447.pdf
    • https://s3.amazonaws.com/piwanisaj/aprender_a_leer_japones.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b146.bin
f9dc731784019eac84982597460387182a692dbd79b4da6fc8c8156208937c8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB146 5416 bytes
font_01_sfnt_off0000c39e.bin
d8eeb0b55465a0bd193c634d985ef82bd624f8b2a179b3534ae902a1e8e29d9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC39E 10664 bytes

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