Malicious PDF — malware analysis report

Static analysis result for SHA-256 6635933af69b4b27…

MALICIOUS

PDF

226.9 KB Created: 2021-07-07 14:56:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d00eb2f3005a6856e90d8498f74c6e37 SHA-1: f984ca153f7240e670287a7b17efddfc68fd2e3a SHA-256: 6635933af69b4b278b27ac47c32e3bd204992a67a6b8f923381c26778ab6e90e
132 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it presents a fake CAPTCHA and a download button, aiming to trick the user into installing a browser extension or plugin. The document body, though heavily obfuscated, contains references to 'Pokemon Go Free Zekrom' and a URL associated with game hacks, aligning with social engineering lures. The presence of an external URI pointing to a game hack site further supports this attack pattern.

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-zekrom-game-hack
    • https://edu.kyst.com.tw/image/data/files/robux-hack-me_GM431946152.pdf
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-stuff_GM406889139.pdf
    • https://edu.kyst.com.tw/image/data/files/real-working-coin-master-hack_GM406889139.pdf
    • https://edu.kyst.com.tw/image/data/files/minecraft-cheats-pc-2021_GM479516143.pdf
    • https://edu.kyst.com.tw/image/data/files/free-spins-on-coin-master-link_GM406889139.pdf
    • https://edu.kyst.com.tw/image/data/files/coin-master-spins-and-coins_GM406889139.pdf
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-spins-generator_GM406889139.pdf
    • https://edu.kyst.com.tw/image/data/files/how-to-get-free-stuff-on-the-catalog-roblox-2021_GM431946152.pdf
    • https://edu.kyst.com.tw/image/data/files/robux-gift-card-free_GM431946152.pdf
    • https://edu.kyst.com.tw/image/data/files/cheat-files-robux-generator_GM431946152.pdf
    • https://edu.kyst.com.tw/image/data/files/coin-master-cheats-free-spins_GM406889139.pdf
    • https://edu.kyst.com.tw/image/data/files/www-cheatsk-com-coin-master-hack_GM406889139.pdf
    • https://edu.kyst.com.tw/image/data/files/is-minecraft-free-on-mac_GM479516143.pdf
    • https://edu.kyst.com.tw/image/data/files/add-robux_GM431946152.pdf
    • https://edu.kyst.com.tw/image/data/files/free-2021-robux_GM431946152.pdf
    • https://edu.kyst.com.tw/image/data/files/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdf
    • https://edu.kyst.com.tw/image/data/files/games-in-roblox-that-give-you-robux_GM431946152.pdf
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-spins-link-today-new_GM406889139.pdf
    • https://edu.kyst.com.tw/image/data/files/robux-com-free_GM431946152.pdf
    • https://edu.kyst.com.tw/image/data/files/how-to-get-a-lot-of-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_023_off000320c7.bin
85bc23c6656714e738b8091a5319452fc8cbc1dfb53877892dab251b662f92f8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x320C7 25576 bytes
font_01_sfnt_off00035ccc.bin
fa7e82bf4d2d9d9f31bfb93c172d68aee85d72b25d3f929f566e7c1915b9023b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x35CCC 18452 bytes

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