Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d02449c47044a8…

MALICIOUS

PDF

43.5 KB Created: 2021-05-14 10:35:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a278f336af14e4dc2a34af64bd4f379f SHA-1: 074f5700366437135ad8d9ebb275b559a9a26351 SHA-256: a4d02449c47044a807a75bbe3b3e0cbc83c468c4c954514f1664d276a3be3d02
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a fake CAPTCHA lure, aiming to trick users into clicking a link for 'Free Robux'. The embedded URL and numerous other URLs in the document body point to sites offering game hacks and cheats, suggesting a phishing or scam campaign. While no scripts were explicitly extracted, the presence of a fake CAPTCHA and external links strongly indicates an attempt to lead the user to a malicious download or phishing page.

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/free-robux-for-kids-no-verification-game-hack
    • http://www.occquimica.com.br/images/roblox-system_GM431946152.pdf
    • http://www.occquimica.com.br/images/coin-master-mod-apk-free-download-for-android_GM406889139.pdf
    • http://www.occquimica.com.br/images/coin-master-hack-co_GM406889139.pdf
    • http://www.occquimica.com.br/images/coin-master-hack-2021-ios-download_GM406889139.pdf
    • http://www.occquimica.com.br/images/minecraft-free-apk-java-edition_GM479516143.pdf
    • http://www.occquimica.com.br/images/how-to-earn-robux-for-free-2021_GM431946152.pdf
    • http://www.occquimica.com.br/images/roblox-hack-unlimited-robux_GM431946152.pdf
    • http://www.occquimica.com.br/images/minecraft-login-free_GM479516143.pdf
    • http://www.occquimica.com.br/images/hacks-for-coin-master-game_GM406889139.pdf
    • http://www.occquimica.com.br/images/how-to-get-free-shirts-on-roblox_GM431946152.pdf
    • http://www.occquimica.com.br/images/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdf
    • http://www.occquimica.com.br/images/free-mod-apk-coin-master_GM406889139.pdf
    • http://www.occquimica.com.br/images/free-robux-no-scam_GM431946152.pdf
    • http://www.occquimica.com.br/images/get-free-food-in-coin-master_GM406889139.pdf
    • http://www.occquimica.com.br/images/roblox-hack-codes_GM431946152.pdf
    • http://www.occquimica.com.br/images/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdf
    • http://www.occquimica.com.br/images/blogspot-free-spins-coin-master_GM406889139.pdf
    • http://www.occquimica.com.br/images/blogspot-coin-master_GM406889139.pdf
    • http://www.occquimica.com.br/images/hack-coin-master-2021_GM406889139.pdf
    • http://www.occquimica.com.br/images/coinmasterfreespins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bcb.bin
bba3751d5100992f518c09e37ac13f7910211f3aece4f7b5b944a7715f64c9d0
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BCB 25376 bytes
font_01_sfnt_off00008642.bin
abcd165e4b695e85902e5e0162dd8c883b494cae8faf27dbfb1f0dc34095f980
pdf-font-stream PDF embedded font (sfnt) at offset 0x8642 18776 bytes