Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd2df38625d83eb…

MALICIOUS

PDF

36.0 KB Created: 2020-04-10 03:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9f53130e4df55b48f644ea730a1635c0 SHA-1: aede24353d72917b29c187814465e70ef4e59e7d SHA-256: 3cd2df38625d83eb5804da5d6924bac2929a4f2de2ef724101d5f58db74e662a
100 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript and a large number of external links, many of which point to other PDF files hosted on similar domains. This behavior is indicative of a link farm or SEO spam campaign designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://misssupremepurityqueen.com/uploads/1/3/0/4/130435966/130435966.html#tails+of+equestria+pdf+download+free
    • http://masstrappers.net/uploads/1/3/0/5/130547486/74476.pdf
    • http://ccmclb.com/uploads/1/3/1/3/131398187/pebekesuvexuxira.pdf
    • http://edsanseverinophotography.com/uploads/1/3/0/4/130435783/2043376.pdf
    • http://paprepservices.com/uploads/1/3/0/5/130543092/bixakenodewopam.pdf
    • http://orderedelements.org/uploads/1/3/0/5/130544136/xuvetaxozonoduxifor.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_off00006147.bin
e9bdb542cac8b5b82d889110c21b6118f82336911456df5d8e41202862750ca5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6147 8732 bytes

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