Malicious PDF — malware analysis report

Static analysis result for SHA-256 5207b0a54f4ebcd6…

MALICIOUS

PDF

47.0 KB Created: 2020-04-23 19:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c14a6054410e447f8a8a27123ebcbc27 SHA-1: a24b39ca76b87d18d23385dd286b8fbad8b691b6 SHA-256: 5207b0a54f4ebcd6910867815180514c06753d971c692658cd778e5dca953af7
70 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, indicating it is designed to redirect users to numerous other PDF documents hosted on various domains. The document body text and embedded URLs suggest a lure related to 'virtual keyboard synthesizer software free', likely a pretext to encourage clicks. The presence of a 'download button' heuristic further supports the social engineering aspect of this attack. The primary IOCs are the URLs pointing to the linked PDFs, which are likely part of a SEO poisoning or link farm strategy.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://theinsulationprosleaguecity.com/uploads/1/3/1/3/131379015/131379015.html#virtual+keyboard+synthesizer+software+free
    • http://haitianbusinessesevents.com/uploads/1/3/0/5/130544089/4249730.pdf
    • http://rubycubediy.com/uploads/1/3/0/6/130639258/jedugijomuvew.pdf
    • http://nhan-tien-quoc-te-viet-nam.online/uploads/1/3/0/4/130483348/3462371.pdf
    • http://legionriskmanagement.com/uploads/1/3/1/4/131406798/niboriduma-ritoraluka-vawimovetagi.pdf
    • http://4uproperty.com/uploads/1/3/1/3/131398452/selapa.pdf
    • http://elalmacendelcalzado.com/uploads/1/3/0/7/130776603/nepog_reritir_wulupatenu.pdf
    • http://ziptogo.ca/uploads/1/3/1/4/131406222/665007.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_off00007c3c.bin
82f57773919b33da0d09dd2c7046b9eed1860ff0885bd45a78a7375a8a308015		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3C 8012 bytes
font_01_sfnt_off00009b3f.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B3F 16036 bytes

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