Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2bf3f7dbb98f9c…

MALICIOUS

PDF

52.0 KB Created: 2021-06-07 10:03:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f6006e3b64b8e9ca37eb77a23df068b6 SHA-1: 8a6abc19a8b3cdd472e78ea90009db27b02129cc SHA-256: 9f2bf3f7dbb98f9c8ea01cbab69442c9e865b7c97c32aa13396beb875c6cb4d2
82 Risk Score

Malware Insights

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

The document presents itself as a "hacks for Roblox" download, employing a fake CAPTCHA lure to trick users into interacting with malicious links. The embedded URLs, such as https://netcdn.tw/app/431946152/hacks-for-roblox-2021-admin-hacks-dowload-game-hack, likely lead to the download of a second-stage payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9464

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/hacks-for-roblox-2021-admin-hacks-dowload-game-hack
    • http://bufbd.org/images/coin-master-hack-2021-without-human-verification_GM406889139.pdf
    • http://bufbd.org/images/how-to-free-robux_GM431946152.pdf
    • http://bufbd.org/images/minecraft-free-download-ipad_GM479516143.pdf
    • http://bufbd.org/images/free-robux-offers_GM431946152.pdf
    • http://bufbd.org/images/roblox-free-accessories_GM431946152.pdf
    • http://bufbd.org/images/link-for-free-spins-on-coin-master_GM406889139.pdf
    • http://bufbd.org/images/roblox-promo-code-to-get-free-robux_GM431946152.pdf
    • http://bufbd.org/images/free-minecraft-skins_GM479516143.pdf
    • http://bufbd.org/images/minecraft-free-play-now_GM479516143.pdf
    • http://bufbd.org/images/free-things-on-roblox_GM431946152.pdf
    • http://bufbd.org/images/master-free-spins-and-coins_GM406889139.pdf
    • http://bufbd.org/images/free-robux-link_GM431946152.pdf
    • http://bufbd.org/images/coin-master-free-link-spin_GM406889139.pdf
    • http://bufbd.org/images/how-to-get-free-robux-on-android_GM431946152.pdf
    • http://bufbd.org/images/is-it-possible-to-get-free-robux_GM431946152.pdf
    • http://bufbd.org/images/universal-minecraft-converter-free_GM479516143.pdf
    • http://bufbd.org/images/can-you-get-robux-for-free_GM431946152.pdf
    • http://bufbd.org/images/coin-master-jackpot-madness-hack_GM406889139.pdf
    • http://bufbd.org/images/coin-master-hack-2021-link_GM406889139.pdf
    • http://bufbd.org/images/free-robux-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005147.bin
f366bf3d477965d05197a75225c5c17de611efb5f2b6defa3608351477fb7aab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5147 30956 bytes
font_01_sfnt_off00009978.bin
4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9978 3400 bytes
font_02_sfnt_off0000a4a2.bin
60d8bf11fc16fcb1f3852b7ad4aa3922fa3a459e8016ff9898bccf8c00bc2ce7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4A2 19632 bytes

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