Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9da87e4a92db06b…

MALICIOUS

PDF

48.1 KB Created: 2021-06-09 12:06:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8a1b9bcd2b0797365f7427be0b494ff2 SHA-1: 10ec5c445bb599bac4f552091e2aec4a6c8c67e1 SHA-256: f9da87e4a92db06bb8e747b5a3c186ee0d04e3901854ea1832d1380d3b2fa429
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to game cheats and identity fraud, directing users to a malicious URL. The ML classifier strongly indicated maliciousness, and multiple heuristics identified external URI links and a download button lure. The primary malicious URL identified is https://netcdn.tw/app/431946152/identity-fraud-roblox-cheats-game-hack, which likely serves as a redirector to a further malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/identity-fraud-roblox-cheats-game-hack PDF link annotation
    • http://legs11.co.za/images/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://legs11.co.za/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://legs11.co.za/images/what-is-coin-master-app_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/free-robux-come_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/hack-coin-master-xyz_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/get-free-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://legs11.co.za/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/coin-master-hack-spin-ios_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/coin-master-game-download-free_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://legs11.co.za/images/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/break-free-song-id-roblox_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/coinmaster-com_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/free-injecters-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5226 26432 bytes
SHA-256: 9395910616d2131c57696f8d2c1ebc3a0181c9428f80c91b3159f940ff0673b7
font_01_sfnt_off00008d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4B 2820 bytes
SHA-256: 96a70491b0783ad8c6fc9b11a18f021aa22c69ac41ee4499b781d16a1b99b689
font_02_sfnt_off000096ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96EC 19060 bytes
SHA-256: 103c31c9b5cd124e1bf0ab81edd4d9582b90d76765ad42d594bfc4b6f577132a

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