Malicious PDF — malware analysis report

Static analysis result for SHA-256 905bfd2eeb1477be…

MALICIOUS

PDF

37.5 KB Created: 2020-05-13 08:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c0aba3e38ab5240107aedfb7a13701bd SHA-1: 9755c585a36cd2a5fe6e89c5696575272c97554c SHA-256: 905bfd2eeb1477be88b53659c0777839cdba16fba019d49475a11d0fb416c644
92 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to other PDFs on different domains. This behavior is indicative of a link farm or SEO manipulation tactic, likely intended to drive traffic to malicious or compromised websites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a more specific attack pattern beyond the link farm. The primary IOCs are the numerous external URLs embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://heimbrothers.com/uploads/1/3/0/6/130639679/130639679.html#darker+side+of+the+moon+sphinx+answers
    • http://truephysicaltherapy.com/uploads/1/3/0/6/130621353/gelojekosuxu-xitubiwis-kepadibawawiwug.pdf
    • http://designer-parties.com/uploads/1/3/0/4/130436152/ca948fb967.pdf
    • http://mrbarsavvy.net/uploads/1/3/1/8/131871744/jifibusemek.pdf
    • http://betweentheworkweek.com/uploads/1/3/0/3/130379424/e72e893f99c96.pdf
    • http://beachvolleyballevents.com/uploads/1/3/0/6/130620952/bigibi-kojobakati-xikug.pdf
    • http://lifeinlefferts.com/uploads/1/3/0/2/130291579/29e0c1b4ee3.pdf
    • http://gladiatortaxservice.com/uploads/1/3/0/5/130543667/323226.pdf
    • http://gunghotraining.com/uploads/1/3/0/7/130740292/0f0ef7.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005341.bin
77677ef0c0d9096dbb3eafa9adf9683c906d37fc8ca19b4ee3c5065d65fd72de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5341 5488 bytes
font_01_sfnt_off00006686.bin
dd698770f7a88981778f0cc7da83190971db22553f91f9f0acd9bc0cde3eb11d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6686 10744 bytes

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