Malicious PDF — malware analysis report

Static analysis result for SHA-256 9435bfe41b66762a…

MALICIOUS

PDF

44.0 KB Created: 2021-05-14 13:55:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5d2b323c582d237c0fae147b506f0d7e SHA-1: 1a6b356a13ceb09e6a234a32b15c1a482b2c7886 SHA-256: 9435bfe41b66762a34300f69226c5c1e2e0976543540407ffa533888f718ac31
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure to trick users into clicking a malicious link, which is a common social engineering tactic. The embedded URL, https://netcdn.xyz/app/431946152/how-to-get-free-roblox-game-hack, likely leads to a second-stage download or phishing page. While no scripts were explicitly extracted, the PDF structure and heuristics suggest an attempt to exploit user interaction for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-roblox-game-hack
    • http://www.cosver.nl/images/coin-master-hack-game_GM406889139.pdf
    • http://www.cosver.nl/images/coin-master-free-daily-spins_GM406889139.pdf
    • http://www.cosver.nl/images/roblox-gift-card-free-codes_GM431946152.pdf
    • http://www.cosver.nl/images/coin-master-facebook-free-spins_GM406889139.pdf
    • http://www.cosver.nl/images/minecraft-ps3-free-download_GM479516143.pdf
    • http://www.cosver.nl/images/free-robux-for-kids_GM431946152.pdf
    • http://www.cosver.nl/images/free-robux-generator-2021_GM431946152.pdf
    • http://www.cosver.nl/images/minecraft-texture-packs-free-download_GM479516143.pdf
    • http://www.cosver.nl/images/coin-master-free-spins-youthnow_GM406889139.pdf
    • http://www.cosver.nl/images/roblox-com-r_GM431946152.pdf
    • http://www.cosver.nl/images/robux-hack-2021_GM431946152.pdf
    • http://www.cosver.nl/images/static-moonactive-net-link_GM406889139.pdf
    • http://www.cosver.nl/images/make-free-robux_GM431946152.pdf
    • http://www.cosver.nl/images/free-spin-coin-master-hack-2021_GM406889139.pdf
    • http://www.cosver.nl/images/free-coins-coin-master-daily_GM406889139.pdf
    • http://www.cosver.nl/images/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdf
    • http://www.cosver.nl/images/free-robux-hacks-no-verification_GM431946152.pdf
    • http://www.cosver.nl/images/toolbox-for-mcpe_GM479516143.pdf
    • http://www.cosver.nl/images/free-roebucks_GM431946152.pdf
    • http://www.cosver.nl/images/microsoft-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004989.bin
eb0c32724a768b5b38373c43d9497fa64bd6501b964d91bd208d8580ec74c688		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4989 28372 bytes
font_01_sfnt_off000089a8.bin
4bd910cbe6e13e3cc1fd56827474962a0b5b839547430a6bf478c6dff96655e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A8 18216 bytes

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