Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba957f49e01b5c2…

MALICIOUS

PDF

40.4 KB Created: 2020-04-08 04:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9fe57aaf4a9cb60a48591bc1eebe1b21 SHA-1: da165837167c2045faaebea77c95e7304478eb40 SHA-256: 3ba957f49e01b5c200539b4d3d5ab74f10e5d14c1ab5c5b80caf0d7ed5344f0e
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. The PDF_SEO_LINK_FARM heuristic firing confirms the presence of a mass external PDF link farm. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to a wide array of other PDF documents hosted on various domains, likely for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://edchmurahockey.com/uploads/1/3/0/7/130776131/130776131.html#madre+tierra+chayanne+letra+video
    • http://countrygirlstreatshop.com/uploads/1/3/1/4/131407315/3344715.pdf
    • http://suntnenorocit245.com/uploads/1/3/0/7/130776037/e947aa0970.pdf
    • http://mercyairmedical.org/uploads/1/3/0/5/130550895/nemogorimalef-rigukuvebomive-kixirogepomefev.pdf
    • http://restaurantcostconsulting.com/uploads/1/3/0/5/130589334/719a2b263cc.pdf
    • http://alwaysamigosyoga.com/uploads/1/3/0/5/130551611/jixuro-xiwuna.pdf
    • http://allproapplianceny.biz/uploads/1/3/0/2/130289564/vetadoto.pdf
    • http://saewing.com/uploads/1/3/0/2/130289625/3669236.pdf
    • http://theudderone.com/uploads/1/3/0/7/130738917/5668c8e8ae9eb1.pdf
    • http://exclusivebrazilvilla.com/uploads/1/3/0/6/130620435/9987e.pdf
    • http://bayareadivorcemidwife.com/uploads/1/3/0/6/130640015/f8f00314f4af0.pdf
    • http://performancebalancer.com/uploads/1/3/0/9/130969391/9130293.pdf
    • http://jeremymatthewmusic.com/uploads/1/3/0/6/130640200/serapakad-wuvavexixi.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_off00006059.bin
40e0157868571602439882c5e1c04fe743cabb107897929bf490bfb58e28080e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6059 8600 bytes
font_01_sfnt_off00007e14.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E14 16036 bytes

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