Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0f61586024a9c6…

MALICIOUS

PDF

44.2 KB Created: 2021-05-17 08:50:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 83c34aee9875f942e8596543f34e0fcd SHA-1: df08d757c783a288f35806666dfff7a8c59857f1 SHA-256: fb0f61586024a9c63c7ad25095d257669ca4bb96596e88cb37c3bdca2dad90c9
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick the user into interacting with it. It contains an embedded URI pointing to a URL that promises free Robux, likely a lure for a malicious download. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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/how-to-get-free-robux-no-survey-game-hack
    • http://eltisstudio.sk/images/coin-master-free-spins-link-download-apk_GM406889139.pdf
    • http://eltisstudio.sk/images/rbx-hut_GM431946152.pdf
    • http://eltisstudio.sk/images/free-spin-app-for-coin-master_GM406889139.pdf
    • http://eltisstudio.sk/images/free-robux-live_GM431946152.pdf
    • http://eltisstudio.sk/images/free-coins-coin-master_GM406889139.pdf
    • http://eltisstudio.sk/images/minecraft-free-play-now_GM479516143.pdf
    • http://eltisstudio.sk/images/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdf
    • http://eltisstudio.sk/images/are-minecraft-realms-free_GM479516143.pdf
    • http://eltisstudio.sk/images/best-free-minecraft-texture-packs_GM479516143.pdf
    • http://eltisstudio.sk/images/free-robux-cards_GM431946152.pdf
    • http://eltisstudio.sk/images/legit-free-spins-coin-master_GM406889139.pdf
    • http://eltisstudio.sk/images/coin-master-hack-2021-apk_GM406889139.pdf
    • http://eltisstudio.sk/images/cmaster-club-coin-master-hack_GM406889139.pdf
    • http://eltisstudio.sk/images/coin-master-hack-tool-pc_GM406889139.pdf
    • http://eltisstudio.sk/images/roblox-hack-me-robux_GM431946152.pdf
    • http://eltisstudio.sk/images/rbx-free-robux_GM431946152.pdf
    • http://eltisstudio.sk/images/free-coins-coin-master-today_GM406889139.pdf
    • http://eltisstudio.sk/images/free-coin-master-spin-daily-link_GM406889139.pdf
    • http://eltisstudio.sk/images/free-mod-apk-coin-master_GM406889139.pdf
    • http://eltisstudio.sk/images/coin-master-hack-version-download-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bd9.bin
f16da87bf3e5c84c2b0b41e4f22e389f691ae5ad8a61cf19a10055ba9f72748c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BD9 27344 bytes
font_01_sfnt_off0000897c.bin
4e9b11cd56806b44a111e59337afa2364f0ba527e2b4797dd95234ca7f902292		 pdf-font-stream PDF embedded font (sfnt) at offset 0x897C 18576 bytes

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