Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b1bc9f0f8cd576…

MALICIOUS

PDF

35.8 KB Created: 2020-04-08 01:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0a62c3fed3de995d30cf40f9be7abc4a SHA-1: a35820dcc0b119ef6ce49568f8d9c8ccd5c43f4d SHA-256: a5b1bc9f0f8cd576d4936076add42f5d88beda0c325098b6d5b04bac3eaca51c
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of external links suggests a malicious intent, possibly to distribute further malware or engage in phishing. The document body contains garbled text and references to 'Yakuza 0 tachibana', which may be a lure or unrelated metadata.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://five9ohdesigns.com/uploads/1/3/0/4/130488698/130488698.html#yakuza+0+tachibana
    • http://sirenpictures.com/uploads/1/3/0/6/130621213/najoforetexexezu.pdf
    • http://carlosgaviriabass.com/uploads/1/3/1/3/131380341/6776643.pdf
    • http://roycepollard.com/uploads/1/3/0/4/130475939/809f56ed8f.pdf
    • http://m7j7led.com/uploads/1/3/0/5/130550774/jatonej_zagewi.pdf
    • http://tricoachatlanta.com/uploads/1/3/0/7/130739713/3c053c0e3af9828.pdf
    • http://aidyn.nyc/uploads/1/3/1/4/131438747/bumoz-pemadake-xejikajabalipud-vamazetif.pdf
    • http://2kids1dog.com/uploads/1/3/0/3/130313098/405ba14c2.pdf
    • http://pnrjason.com/uploads/1/3/0/6/130620729/xexizobikudol.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_off00006487.bin
c9f7a4696af16ce058e67ce55f1a441953f07290a50621a0028d050ead1d81e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6487 7760 bytes

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