Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bd742f616f04eb…

MALICIOUS

PDF

47.8 KB Created: 2021-05-10 16:34:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 22197740302b20bd41cf30d80070d094 SHA-1: ffb2b2d2567ddbf33b1d4fad5d26b36bb30a4341 SHA-256: 18bd742f616f04eb3e4ad7e8f83621b6c03183980545b94fbf6df21355a3cdb1
82 Risk Score

Malware Insights

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

The document displays a fake CAPTCHA lure to deceive users into interacting with embedded links, which likely leads to the download of a second-stage payload. The presence of multiple URLs related to game hacks and cheats suggests a social engineering tactic to entice users. No scripts were extracted, but the PDF structure and ML classifier indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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.xyz/app/431946152/avatar-roblox-game-game-hack
    • http://pustaka.polbangtan-gowa.ac.id/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/how-to-get-robux-easy_GM431946152.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/coin-master-spin-blogspot_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/minecraft-free-download-windows_GM479516143.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/hack-my-spins-coin-master_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/minecraft-free-apk-java-edition_GM479516143.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/toolbox-apk_GM479516143.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/coin-master-free-spins-generator-no-human-verification_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/coin-master-cheats-without-verification_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/how-do-you-hack-for-2021000-coins-on-flip-master_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/apps-that-give-you-free-robux_GM431946152.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/free-draw-roblox_GM431946152.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/free-robux-no-verification-needed_GM431946152.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/coin-master-free-spins-2021_GM406889139.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/free-minecraft-account_GM479516143.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/wurst-download_GM479516143.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • http://pustaka.polbangtan-gowa.ac.id/repository/robux-matchcomfree-robux_GM431946152.pdf
    • http://pustaka.polbangtan-gowa.ac.id//repository/coin-master-hack-mod-apk-2021-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ab6.bin
24f8f9dfadaa6befbcfccff56fa5620dcd020f08dba42c11cba02090b1709693		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AB6 26536 bytes
font_01_sfnt_off0000860e.bin
f462303657ce1de10d3e7d5ae1fe17c8584116bd5bc216971166de87266da924		 pdf-font-stream PDF embedded font (sfnt) at offset 0x860E 7272 bytes
font_02_sfnt_off0000977e.bin
6f25c8042a3cd2790e062f52c9c9b29641286f32198afb86083f56b8b0f15126		 pdf-font-stream PDF embedded font (sfnt) at offset 0x977E 18492 bytes

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