Malicious PDF — malware analysis report

Static analysis result for SHA-256 157b71ae30b1f8be…

MALICIOUS

PDF

228.1 KB Created: 2021-07-08 23:09:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4e656412b47d91c9d193a17be3dd052b SHA-1: 87352fb1d30cc6fa1b56096bfefb6f21f793b924 SHA-256: 157b71ae30b1f8beef630f4bb6590021e488f6232c34db84a02ea666669c84de
132 Risk Score

Malware Insights

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

The file is a PDF that displays a fake CAPTCHA and a fake browser update lure to trick the user into clicking a link. The embedded URL, http://netcdn.tw/app/1094591345/pokemon-go-free-legendary-pokemon-game-hack, likely leads to a second-stage payload download. The document's content and heuristics strongly suggest a social engineering attack aimed at user deception for malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0118

Heuristics 6

  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://netcdn.tw/app/1094591345/pokemon-go-free-legendary-pokemon-game-hack
    • https://mansurabaya-elearning.usmart.id/__statics/gudangsoal/files/free-roblox-adopt-me-pets_GM431946152.pdf
    • https://mansurabaya-elearning.usmart.id/__statics/gudangsoal/files/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdf
    • https://mansurabaya-elearning.usmart.id/__statics/gudangsoal/files/free-roblox-gift-card_GM431946152.pdf
    • https://mansurabaya-elearning.usmart.id/__statics/gudangsoal/files/roblox-hack-robux-gratis-2021_GM431946152.pdf
    • https://mansurabaya-elearning.usmart.id/__statics/gudangsoal/files/free-coin-master-spin-generator_GM406889139.pdf
    • https://mansurabaya-elearning.usmart.id/__statics/gudangsoal/files/is-minecraft-free-on-xbox-one_GM479516143.pdf
    • https://mansurabaya-elearning.usmart.id/__statics/gudangsoal/files/coin-master-hack-version-download-2021-android_GM406889139.pdf
    • https://mansurabaya-elearning.usmart.id/__statics/gudangsoal/files/coinmasterfreespinlink_GM406889139.pdf
    • https://mansurabaya-elearning.usmart.id/__statics/gudangsoal/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • https://mansurabaya-elearning.usmart.id/__statics/gudangsoal/files/free-robux-scam_GM431946152.pdf
    • https://mansurabaya-elearning.usmart.id/__statics/gudangsoal/files/minecraft-java-hacks_GM479516143.pdf
    • https://mansurabaya-elearning.usmart.id/__statics/gudangsoal/files/como-hackear-cuentas-de-roblox-sin-contrasea_GM431946152.pdf
    • https://mansurabaya-elearning.usmart.id/__statics/gudangsoal/files/how-to-get-free-robux-for-free_GM431946152.pdf
    • https://mansurabaya-elearning.usmart.id/__statics/gudangsoal/files/free-robux-just-enter-username-and-password_GM431946152.pdf
    • https://mansurabaya-elearning.usmart.id/__statics/gudangsoal/files/cops-and-robbers-roblox-cheat_GM431946152.pdf
    • https://mansurabaya-elearning.usmart.id/__statics/gudangsoal/files/how-to-get-free-robux-on-roblox-2021-real_GM431946152.pdf
    • https://mansurabaya-elearning.usmart.id/__statics/gudangsoal/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • https://mansurabaya-elearning.usmart.id/__statics/gudangsoal/files/moonactive-coin-master-free-spins-link_GM406889139.pdf
    • https://mansurabaya-elearning.usmart.id/__statics/gudangsoal/files/free-minecraft-website_GM479516143.pdf
    • https://mansurabaya-elearning.usmart.id/__statics/gudangsoal/files/roblox-controversy_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_023_off00032486.bin
9b2b092c776e6ece052eeaa569eb667a2b5946aebeba8e1231356d4f2dfbd72b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32486 25576 bytes
font_01_sfnt_off0003608c.bin
537181f9f38eff4f127cfc458bd58b3b8064d1512a4ad3037c6d34eca5fa4315		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3608C 18712 bytes

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