Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a26c91478d6c2b…

MALICIOUS

PDF

44.2 KB Created: 2021-06-03 20:27:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b29d795fbbd27774ad9a733c2cbca21f SHA-1: 6cd8090dd7a46db873814df3d8e6bcb7a65b6541 SHA-256: 23a26c91478d6c2b28bfc31b6943ec7cecbc5edd12c3e58d65570a43ef79fe6e
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick the user into interacting with it, likely to initiate a download. The embedded URI points to a suspicious URL that is likely hosting a malicious payload. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to exploit user interaction for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/free-800-robux-game-hack
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/coin-master-hack-version-download-2021-ios_GM406889139.pdf
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdf
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/how-do-u-get-free-robux-2021_GM431946152.pdf
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-twitter_GM406889139.pdf
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/hack-coin-master-ios-download_GM406889139.pdf
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/roblox-zone-free-robux_GM431946152.pdf
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/coin-master-hacks-for-free-spins_GM406889139.pdf
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/coin-master-hack-programers_GM406889139.pdf
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/how-to-earn-free-robux_GM431946152.pdf
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master_GM406889139.pdf
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/minecraft-mobile-free_GM479516143.pdf
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdf
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-no-human-verification_GM431946152.pdf
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/google-coin-master-free-spins_GM406889139.pdf
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/instagram-coin-master-free-spins_GM406889139.pdf
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdf
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/minecraft-tower-defense-2-hacked_GM479516143.pdf
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/how-to-hack-coin-master-without-root_GM406889139.pdf
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free_GM479516143.pdf
    • https://www.communes.com
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005169.bin
f66d6ec17d0079965b9af544767076f2798e0cdc1459c1e32b27d3d1d5a304ce		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5169 24644 bytes
font_01_sfnt_off000089e0.bin
2059a7894931e9b75336f5975f03d939213f3fdb926ff7d6db67df9fd1731cb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89E0 18396 bytes

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