Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b3b07e891317a7…

MALICIOUS

PDF

35.1 KB Created: 2021-06-28 08:23:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 79dad7b31b643b143bba1976bf59e3ef SHA-1: 996e199afc9e45ff7414ff75b47fb7b17efa6858 SHA-256: f4b3b07e891317a7e5d877c07c8e21cdbf1ca89cd392c69f3ab6ac75ea25d062
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are related to obtaining free virtual currency or game hacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://netcdn.co/app/431946152/free-robux-no-anti-spam-game-hack PDF link annotation
    • http://digilib.stie-yppi.ac.id/repository/roblox-free-hair-girl_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/give-free-robux-no-ads_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-apocalypse-rising-hack-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-make-a-free-robux-game-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-hack-iphone_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-twitter-free-shirt-templates-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-get-free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/getrobux-me-roblox-online-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/hack-robux-gratis-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/devil-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/www-rbxhut-com_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C2 22240 bytes
SHA-256: 37059b07c244679ed88c1d825746e306b02542700cab2c931a34093216911e58
font_01_sfnt_off00006332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6332 19376 bytes
SHA-256: adec83ced3c17bfd0f35192b2a0c20b405a817b34455544398cbfbdc39cd34d6

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