Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9c5dbccced2cba…

MALICIOUS

PDF

34.7 KB Created: 2021-07-06 15:15:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 033e76a080c65d2bf65cfaa40b72fb7a SHA-1: efeb2a9cf7504162ccf60beaf12f2f18ef9047ca SHA-256: 4f9c5dbccced2cba277f2dd64b89f18e9a521ec14e2eb733f82810c8e0fab510
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document presents a fake CAPTCHA or verification prompt to trick users into interacting with malicious links, such as the one pointing to 'http://netcdn.tw/app/431946152/get-me-robux-for-free-game-hack'. This behavior is consistent with a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. No scripts were extracted, but the presence of external URIs and the fake CAPTCHA heuristic strongly suggest a malicious intent to redirect the user to a harmful site or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/get-me-robux-for-free-game-hack
    • http://elib-s2.ubl.ac.id/repository/free-tiktok-followers-generator_GM835599320.pdf
    • http://elib-s2.ubl.ac.id/repository/how-you-get-free-robux_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/roblox-wizard-tycoon-2-player-hack_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/how-to-get-free-robux-for-pc-2021_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/roblox-robux-hack-club_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/hack-to-get-money-on-bloxburg-roblox_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/minecraft-iphone-free_GM479516143.pdf
    • http://elib-s2.ubl.ac.id/repository/how-to-get-free-robux-2021-working_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/free-robux-generator-no-survey-no-verification_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/youtube-hack-roblox_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/how-to-hack-someone-home-in-roblox-high-school_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/hack-roblox-accounts-website_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/roblox-hack-generator_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/roblox-download-google-play-free_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/microsoft-free-robux_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/easy-way-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdf
    • http://elib-s2.ubl.ac.id/repository/2021-free-roblox-exploit-safe_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/roblox-jailbreak-cheat-codes_GM431946152.pdf
    • http://elib-s2.ubl.ac.id/repository/free-avetars-on-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000315b.bin
83822f8d60032a149cfc3d8bf80b3400313816627dd6698199995f9a741ec964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x315B 22148 bytes
font_01_sfnt_off0000629c.bin
feaab394b075859e694c399921b9b5bf0523619dd427b317c2360992586738dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x629C 19016 bytes

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