Malicious PDF — malware analysis report

Static analysis result for SHA-256 4172f8edc9a06821…

MALICIOUS

PDF

37.1 KB Created: 2020-03-27 02:17:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f2ad2e1f60a3f109c4d92d3942d08788 SHA-1: c0cd4b43f8615e4f009e699d34436d0b938e05d4 SHA-256: 4172f8edc9a06821b7273f3cb1433dee84e2eea0e414e8e5f6f11263d3452c62
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains numerous external links, many of which point to other PDF files hosted on similar domains, indicating a link farm or SEO manipulation tactic. The document body suggests a lure for a "3 player chess game download". The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to potentially malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://acouturelife.com/uploads/1/3/0/6/130621998/130621998.html#3+player+chess+game+download
    • http://hanaleivodka.com/uploads/1/3/0/8/130874554/dolibogasodibatu.pdf
    • http://collabor8ivestudio.com/uploads/1/3/0/2/130270775/021cdb9e.pdf
    • http://techarcana.us/uploads/1/3/0/5/130543168/tufapojadarutaz.pdf
    • http://creatorcoach.co.uk/uploads/1/3/0/7/130776054/959141.pdf
    • http://www.shop.justloseit.com/uploads/1/3/0/4/130483050/banuju_vadutulifipuju.pdf
    • http://thenotionsbox.com/uploads/1/3/0/6/130604086/tijuzelazinide.pdf
    • http://www.evolutionbathrooms.com/uploads/1/3/0/4/130483273/kefavisikadas_fufebexumepuzoj.pdf
    • http://rollersrelics.com/uploads/1/3/0/2/130270804/dogedujifupo.pdf
    • http://mobiledesigntechnology.com/uploads/1/3/0/4/130436093/wutasanakajelanetexi.pdf
    • http://eightdaysmediatest.site/uploads/1/3/0/6/130621838/9123799.pdf
    • http://theadccourse.com/uploads/1/3/0/7/130739348/448751.pdf
    • http://www.kaylapishnak.com/uploads/1/3/0/9/130969164/rapufajade.pdf
    • http://www.heardnewmanrealestate.com/uploads/1/3/0/8/130813785/4800513.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067b6.bin
f87121e3f19ea3d6b5d60a18a6c8eeba1171b21cbe764f65ab762e20ebc43581		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B6 8268 bytes

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