Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a56279576ad876…

MALICIOUS

PDF

31.4 KB Created: 2020-05-31 12:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efd30a9d3152e72c6b835453745983bd SHA-1: 5ed57abf7a7c7999cc8a97c9b8619e6e0526d434 SHA-256: a2a56279576ad876914d7cbcedb740087234bb00da7162f427c5831857b5f292
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF contains numerous external links, many of which are numerically or generically named and hosted on suspicious domains, indicative of a link farm or SEO poisoning tactic. One prominent link, 'http://andrewmodels.com/uploads/1/3/0/2/130270934/130270934.html#qhsusb_bulk+driver+download', suggests a lure for downloading a driver. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the structure and URLs point towards a social engineering attack to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://andrewmodels.com/uploads/1/3/0/2/130270934/130270934.html#qhsusb_bulk+driver+download
    • http://sterepair-service.com/uploads/1/3/1/4/131437626/bomenisalagatewatan.pdf
    • http://hostmaster.thestresshub.com/uploads/1/3/1/4/131454656/kunasojapofamakulozu.pdf
    • http://sebastopoltalentshow.com/uploads/1/3/0/3/130313021/1845273.pdf
    • https://tafibenula.files.wordpress.com/2020/05/koxinapotifuvo.pdf
    • https://sinezuve.files.wordpress.com/2020/05/93046813716.pdf
    • https://buluzoti.files.wordpress.com/2020/05/39737032055.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_off000050ba.bin
463b5fc06254a245748b790dc7cd21345c6bf2ba760b6e60f224e38c8fadf9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50BA 10156 bytes

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