Malicious PDF — malware analysis report

Static analysis result for SHA-256 b808ecde5d569868…

MALICIOUS

PDF

31.7 KB Created: 2020-04-11 13:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: aca3bd061882fb89ac8d328ca8c90b49 SHA-1: ba2d0a16029124513dec79d0d4d7e09f2d362f31 SHA-256: b808ecde5d569868525cdd715bf6c85f5882e33e49774836b172c617dc7505cd
92 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution mechanism. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body was largely unreadable, making the link farm the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 3

  • 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
  • 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://jewelrywithjess.com/uploads/1/3/0/6/130604952/130604952.html#santa+tutu+dress+tutorial
    • http://thehustlersdiet.org/uploads/1/3/0/8/130813025/xolazil.pdf
    • http://bigapplecprnyc.com/uploads/1/3/0/6/130639162/1c8be246675.pdf
    • http://tailwindfoods.ca/uploads/1/3/0/4/130488101/3246126.pdf
    • http://befittolive.org/uploads/1/3/0/6/130622063/tezawugipapudew.pdf
    • http://follygirl.org/uploads/1/3/0/4/130476272/96077f7f437ece1.pdf
    • http://aspenlanephotography.com/uploads/1/3/0/4/130483911/0a9f033bbdc4.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_off00005267.bin
2a1115be2c27cfa877f4e14e94753dcd93807f5c3b6453678d95f507d00f17b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5267 8096 bytes

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