Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfff01a2af7649b6…

MALICIOUS

PDF

42.2 KB Created: 2020-04-05 03:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4f571cbaa0eefae66bd618df5fb2e074 SHA-1: e032be34169f7f2c9b7b80c3bee15c17227021da SHA-256: bfff01a2af7649b613fabca2af26bea41d5c9da4be195641eec053228144c400
62 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a coordinated effort to distribute content or manipulate search engine results. The document body contains garbled text but includes a reference to 'problemas ecuaciones cuadraticas doc', which may be a lure. The primary function appears to be directing users to a large collection of external PDF files.

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://shuaigroup.org/uploads/1/3/0/4/130489841/130489841.html#problemas+ecuaciones+cuadraticas+doc
    • http://grotonricker.com/uploads/1/3/0/4/130488123/bivoneri.pdf
    • http://mmproductionservices.com/uploads/1/3/0/7/130776196/folede-rufitomezumox-fewuwidu-pugowugewoso.pdf
    • http://dangsthebuilderma.com/uploads/1/3/0/6/130620575/7677938.pdf
    • http://libraryofbeauty.com/uploads/1/3/0/6/130604575/4274949.pdf
    • http://metroexpresscarriers.com/uploads/1/3/0/5/130589094/7158800.pdf
    • http://urchig.com/uploads/1/3/1/3/131380908/294ed5fefbeeb.pdf
    • http://yourpackaging.design/uploads/1/3/1/4/131407088/19f30b9d.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_off000067a1.bin
33f1ee729fcb0e9cec85910610f5d7ee566cb745a61edcfc57537409b932c861		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A1 12820 bytes
font_01_sfnt_off000090ce.bin
2bbb93340edbd30279e3ccdfaaf7d3747fc0738ab423ebb88b9b0913653ec546		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90CE 2612 bytes

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