Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d921b7ade50b34…

MALICIOUS

PDF

45.8 KB Created: 2021-06-09 10:08:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fe410ab6d10581e35ec97e096e333bf4 SHA-1: b94158f1c8496b4d2533fe32258f68ef53170da7 SHA-256: 88d921b7ade50b3453ce5f738c5d2fcad96af86c3a73fe317776672bba99263a
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick users into downloading further content, as indicated by the 'SE_FAKE_CAPTCHA' heuristic. The embedded URLs and document body suggest a lure related to hacking games like Roblox, likely leading to the download of additional malicious files. No scripts were extracted, but the presence of multiple malicious URLs and the fake CAPTCHA strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/how-to-hack-roblox-using-game-guardian-game-hack
    • http://modlingua.com/images/free-robux-no-verification_GM431946152.pdf
    • http://modlingua.com/images/free-robux-link_GM431946152.pdf
    • http://modlingua.com/images/google-coin-master-free-spins_GM406889139.pdf
    • http://modlingua.com/images/free-roblox-hack_GM431946152.pdf
    • http://modlingua.com/images/free-robux-with-no-human-verification_GM431946152.pdf
    • http://modlingua.com/images/free-robux-real-2021_GM431946152.pdf
    • http://modlingua.com/images/free-whatsapp-tik-tok-status-download_GM835599320.pdf
    • http://modlingua.com/images/mad-city-roblox-hack-client_GM431946152.pdf
    • http://modlingua.com/images/roblox-apk-hack_GM431946152.pdf
    • http://modlingua.com/images/free-spins-and-coins-coin-master_GM406889139.pdf
    • http://modlingua.com/images/roblox-free-no-download-or-install_GM431946152.pdf
    • http://modlingua.com/images/is-there-a-way-to-get-free-robux_GM431946152.pdf
    • http://modlingua.com/images/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdf
    • http://modlingua.com/images/robux_GM431946152.pdf
    • http://modlingua.com/images/kat-hack-roblox_GM431946152.pdf
    • http://modlingua.com/images/addget-free-roblox-robloxcom_GM431946152.pdf
    • http://modlingua.com/images/how-to-o-get-free-coin-master-spins_GM406889139.pdf
    • http://modlingua.com/images/how-to-get-free-tiktok-followers-no-human-verification_GM835599320.pdf
    • http://modlingua.com/images/coin-master-free-download-for-pc_GM406889139.pdf
    • http://modlingua.com/images/robux-generator-free-download-no-survey_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005247.bin
cadac38c35229919edfde268c30e3cc371b93ed33f9a62a7da2ad7e7ba957329		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5247 25268 bytes
font_01_sfnt_off00008ca0.bin
552db52006f5f805843811e3ac673f8213f95b914c5f7856c7177314d6a13bb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA0 19512 bytes

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