Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce7b7f2bdebd5467…

MALICIOUS

PDF

40.3 KB Created: 2020-05-20 20:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b080acb89926f5015c94c32877938d1d SHA-1: 8acd2f86bc285f6254df8f03c4220286a546f081 SHA-256: ce7b7f2bdebd54670b974009092e588f800d710eae380756d621a071313b209c
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The presence of multiple SEO-optimized PDF links suggests an attempt to manipulate search engine results or to host malicious content across a distributed network of sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://yaredimmtratax.com/uploads/1/3/1/6/131606617/131606617.html#fallout+4+deadlier+deathclaws
    • http://aday-late.com/uploads/1/3/1/8/131856125/09d348c2ca7ae.pdf
    • http://eaglehvac.org/uploads/1/3/0/2/130273581/5560319.pdf
    • http://milarapizo.com/uploads/1/3/1/0/131070493/9895437.pdf
    • http://4myspanishclass.com/uploads/1/3/1/4/131453329/rudatote.pdf
    • http://rhminden.ca/uploads/1/3/1/6/131637371/fuzowen.pdf
    • http://cabinetcp.com/uploads/1/3/1/4/131410370/zameron.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_off00007526.bin
8530610ea5ddd52987887cbf892872c4850520a6f20e605504c46ffa9e67d46b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7526 9900 bytes

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