Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad2b2c0cb457f4c…

MALICIOUS

PDF

46.0 KB Created: 2021-06-11 08:15:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d24a0a0826851f2488b6a2a5c3425adb SHA-1: 0bb6032d72c8c0407a7972f5d0b12a8fdb05f02d SHA-256: bad2b2c0cb457f4c5b1770331aaf46665c106b9c6ea6a49d4f5ce14f599e23ff
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a fake CAPTCHA lure designed to trick the user into downloading a malicious file, likely game hacks. The document embeds multiple URLs pointing to these purported hacks, with one prominent URL being https://netcdn.tw/app/431946152/hack-strucid-stop-start-roblox-game-hack. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/hack-strucid-stop-start-roblox-game-hack
    • http://perpustakaan.bkkbnkaltim.id/repository/free-robux-apps-that-work_GM431946152.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/roblox-hack-unlimited-robux_GM431946152.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/free-coins-coin-master-2021_GM406889139.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/play-minecraft-online-free_GM479516143.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/how-to-hack-to-get-robux_GM431946152.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/earn-free-robux-on-roblox_GM431946152.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/roblox-zone-free-robux_GM431946152.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/hacks-for-minecraft-bedrock_GM479516143.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/free-robux-real-2021_GM431946152.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/roblox-fly-hack-2021_GM431946152.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/free-robux-no-download_GM431946152.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/freerobux-hack-us_GM431946152.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/free-spins-coin-master-app-ios_GM406889139.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/hack-my-game-xyz-coin-master_GM406889139.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/free-robux-without-verification_GM431946152.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/oprewards-free-robux_GM431946152.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/minecraft-apk-download-v1-144-2-free_GM479516143.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/get-free-spins-coin-master-2021_GM406889139.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/vehcle-simulator-hack-roblox_GM431946152.pdf
    • http://perpustakaan.bkkbnkaltim.id/repository/websites-to-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054e2.bin
645dff4fc26bb1736b16aecb023e52888ef2bff6424e1abefdf78fa5bf3657af		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54E2 25212 bytes
font_01_sfnt_off00008f2f.bin
7c01dc44db9576cc570c6c72e3b73760a6d04cb84d9fc590c95405c77071ced4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F2F 18896 bytes

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