Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c81409afdef7bd5…

MALICIOUS

PDF

42.3 KB Created: 2021-04-30 03:44:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 422705ceda336d4faaa4f7b6a18f7581 SHA-1: fbe8007b9aca2063fd6cb97b7645a01ffb94ca73 SHA-256: 0c81409afdef7bd5e09b9e075edcaae562fd169af76407494b67cec8093df0c6
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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 https://netcdn.xyz/app/431946152/download-synapse-roblox-hack-free-game-hack PDF link annotation
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/how-to-noclip-in-roblox-jailbreak-cheat-engine.pdfIn PDF document text
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/free-roblox-cookie-logger.pdfIn PDF document text
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/capture-flag-map-roblox-free.pdfIn PDF document text
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/my-roblox-account-got-hacked.pdfIn PDF document text
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/how-to-get-free-robux-in-ios-ipad.pdfIn PDF document text
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/how-to-get-free-robux-mak20217.pdfIn PDF document text
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/roblox-free-catalog-items-list.pdfIn PDF document text
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/holiday-crown-roblox-free.pdfIn PDF document text
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/free-robux-gift-card-codes-live.pdfIn PDF document text
    • http://www.weworkkuwait.com/uploaded_files/userfiles/files/hack-denisdaily-on-roblox.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
stream_003_off00004414.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4414 26456 bytes
SHA-256: dd71791fe1d2fa3d10e25e119cd4087848e31e1a6457814680f7faa7a58915c6
font_01_sfnt_off000080bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80BD 19208 bytes
SHA-256: 74161b2605d553d548dbae92a69bcca8335d6bb5edbf1397f9481a5b15721a8e

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