Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7966d8a7a09b4c0…

MALICIOUS

PDF

48.2 KB Created: 2021-06-11 09:03:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 220ef7480ff217a216510b3eb5e65f2f SHA-1: bda1334565be8dc3c4bf6e3060569368cf7d12ee SHA-256: d7966d8a7a09b4c01b0db446d532ae0fbeda339044689e245e1e0aca15cfb64c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document presents a fake CAPTCHA or human verification prompt to trick users into interacting with it, likely to initiate a download. The presence of multiple URLs pointing to game-related freebies and hacks suggests a lure for users seeking such content. While no scripts were directly extracted, the PDF structure and heuristics indicate it's designed to exploit user interaction, potentially leading to the execution of further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

Heuristics 5

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/a-promo-code-that-gives-us-free-robux-no-waiting-game-hack
    • https://promoindihomejateng.com/ckfinder/userfiles/files/best-free-minecraft-hacked-client_GM479516143.pdf
    • https://promoindihomejateng.com/ckfinder/userfiles/files/minecraft-free-minecraft_GM479516143.pdf
    • https://promoindihomejateng.com/ckfinder/userfiles/files/how-to-get-free-roblox-items_GM431946152.pdf
    • https://promoindihomejateng.com/ckfinder/userfiles/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • https://promoindihomejateng.com/ckfinder/userfiles/files/free-robux-codes-no-verification_GM431946152.pdf
    • https://promoindihomejateng.com/ckfinder/userfiles/files/roblox-t-shirt-free_GM431946152.pdf
    • https://promoindihomejateng.com/ckfinder/userfiles/files/coinmaster-spin-ml-free_GM406889139.pdf
    • https://promoindihomejateng.com/ckfinder/userfiles/files/roblox-premium-free_GM431946152.pdf
    • https://promoindihomejateng.com/ckfinder/userfiles/files/roblox-free-robux-generator_GM431946152.pdf
    • https://promoindihomejateng.com/ckfinder/userfiles/files/free-roblox-followers-generator-2021_GM431946152.pdf
    • https://promoindihomejateng.com/ckfinder/userfiles/files/best-free-spins-for-coin-master_GM406889139.pdf
    • https://promoindihomejateng.com/ckfinder/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdf
    • https://promoindihomejateng.com/ckfinder/userfiles/files/can-u-get-free-robux_GM431946152.pdf
    • https://promoindihomejateng.com/ckfinder/userfiles/files/free-spin-coin-master-2021-link_GM406889139.pdf
    • https://promoindihomejateng.com/ckfinder/userfiles/files/rblx-gg-free-robux_GM431946152.pdf
    • https://promoindihomejateng.com/ckfinder/userfiles/files/earn-free-robux-today_GM431946152.pdf
    • https://promoindihomejateng.com/ckfinder/userfiles/files/free-robux-site_GM431946152.pdf
    • https://promoindihomejateng.com/ckfinder/userfiles/files/coin-master-free-gifts_GM406889139.pdf
    • https://promoindihomejateng.com/ckfinder/userfiles/files/tiktok-free-coins_GM835599320.pdf
    • https://promoindihomejateng.com/ckfinder/userfiles/files/roblox-robux-generator-tool_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005439.bin
3e2aa24b350bb3b8a0bf1045f778b03baabd9aca7f8c33e0ea5918688f7fdc85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5439 28244 bytes
font_01_sfnt_off0000950f.bin
2c76e0df942aff905eefacfeec7dfdd9d87c81f46dffb9d9220ecb5f7c42147e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x950F 20008 bytes

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