Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad766daa31255cfd…

MALICIOUS

PDF

41.4 KB Created: 2020-04-04 10:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a4fdc5b6c1046a201c1234d242daee9b SHA-1: 39c63bceed42cdde152c7cf1cefa92f384e26c5c SHA-256: ad766daa31255cfd0af0664247c677417a99dde2166991f24a4f2c02bbfe75b3
92 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier and contains a significant number of external links, characteristic of a link farm. The primary purpose appears to be directing users to a collection of other PDF files hosted on various domains. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a more specific attack pattern beyond link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yujiaohong.com/uploads/1/3/0/7/130775520/130775520.html#1+5+psig+to+psia
    • http://emilysadecki.com/uploads/1/3/0/6/130603822/koxipiteraxa.pdf
    • http://christine-smithdesign.com/uploads/1/3/0/8/130814466/3d8a17.pdf
    • http://gramatec.net/uploads/1/3/0/2/130270937/gumofinasufegaf.pdf
    • http://rorsystems.net/uploads/1/3/0/6/130605426/ad0086d9126712.pdf
    • http://jkgconsulting.ca/uploads/1/3/0/5/130588484/notigedig-segevigasawem.pdf
    • http://fireselkiecreations.com/uploads/1/3/0/7/130775983/mupovanesiv-kuruwufoj.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_off00006f33.bin
0f44818b3e23e03c4cff920866fcaaa94ca5f7c7a5c9386036f15a84af6ed452		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F33 8404 bytes
font_01_sfnt_off00008fbe.bin
cf2338b7895a3a873add1db7dfb411390262a2a3d24e5b3dccff59843624ea97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FBE 2704 bytes

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