Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a853dd031e91a9…

MALICIOUS

PDF

28.6 KB Created: 2020-06-08 13:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f32b2fd5ebb9cd1063dcd04e9286d13c SHA-1: 360a374b8f012d7c49704f6c41718a5fcbe3e486 SHA-256: 40a853dd031e91a9c4d4e7c40f1db230baac18ffca7aabffe7430945db8b28cf
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 User Execution

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body contains text related to 'C est pas sorcier port de rotterdam' and metadata indicating it was generated by wkhtmltopdf, suggesting a potential lure or content stuffing technique. The primary purpose appears to be directing users to a network of linked PDF files hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://scrubs4work.com/uploads/1/3/0/6/130604636/130604636.html#c+est+pas+sorcier+port+de+rotterdam
    • http://cudp.com/uploads/1/3/0/5/130588934/bililokedasetobofidi.pdf
    • http://the-ecobarn.com/uploads/1/3/1/3/131398184/354c5f.pdf
    • http://artemiseyewear.com/uploads/1/3/0/3/130379653/jitutux.pdf
    • http://bobbesserpools.com/uploads/1/3/0/8/130814830/5151799.pdf
    • http://columbiarei.com/uploads/1/3/0/4/130436271/gabezaxe.pdf
    • http://allenbonde.com/uploads/1/3/0/7/130775854/a19d5f.pdf
    • https://dawujokori.files.wordpress.com/2020/06/13710696546.pdf
    • https://fulazetula.files.wordpress.com/2020/06/xawopukelumiz.pdf
    • https://fagaxopamite.files.wordpress.com/2020/06/88078710413.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004316.bin
58f9ce07d64d50bb032319ba245d56792f9e2dc109f8fdbfba0d806b2537bd18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4316 11200 bytes

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