Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3eb3f23a8aef43…

MALICIOUS

PDF

35.6 KB Created: 2020-04-17 08:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9c3d068f8e2dcad34ede2a0506f27283 SHA-1: 3c0751ee2f154eee20a77f79c74e6ae0582c14ca SHA-256: 4b3eb3f23a8aef4326496b9916cb51b827048e6661d0fb8c67dc2710e7906e50
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files on various domains. This behavior is indicative of a link farm or SEO abuse, likely intended to drive traffic or host malicious content. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest a coordinated effort to distribute content across multiple domains.

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://ghosttrainband.com/uploads/1/3/1/4/131438672/131438672.html#home+depot+sheetrock+joint+compound
    • http://monteur-zimmer-gelsenkirchen.de/uploads/1/3/0/9/130969777/4cf92910.pdf
    • http://estrellasydeseos.net/uploads/1/3/0/2/130272848/6093979.pdf
    • http://epoxyworksflooring.com/uploads/1/3/0/6/130604309/vixep_mebolikerupoli_dabawugukemu.pdf
    • http://thelonline.com/uploads/1/3/0/6/130622083/b239ccd496fa04f.pdf
    • http://personalizedsudoku.com/uploads/1/3/1/3/131381231/4c4b404127818.pdf
    • http://medmico-h2020.com/uploads/1/3/0/6/130605206/nazuwo-tironilozomawu-jijedilodebi-fegoj.pdf
    • http://kemonaditas.com/uploads/1/3/0/6/130621038/3218674.pdf
    • http://dbfriday.com/uploads/1/3/1/4/131483009/ninunijuzajuloxavud.pdf
    • http://rorymc.ca/uploads/1/3/0/3/130313489/zifexozivotel.pdf
    • http://sweetcaities.com/uploads/1/3/0/6/130621510/xemomupubekas_gixozesudowi_sovejevipeka_pofejewazurefiw.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_off000050f9.bin
5780fc0c56dcafdb27bb00cf22573dccf7efe83d426ebcc3a7c104ae82bc6dde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50F9 7060 bytes
font_01_sfnt_off00006ce1.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE1 16204 bytes

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