Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7d246215f7d384…

MALICIOUS

PDF

48.4 KB Created: 2021-06-07 03:37:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d04fbe130ecc5f5f424e7cc3f12494e7 SHA-1: 8095fbba2d4ac710895659082e06691c4b0a6c0b SHA-256: 4a7d246215f7d3842744cc69ba4c8ee28d7a1158d5db9d9408f3a3598152ca1c
82 Risk Score

Malware Insights

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

The PDF contains a fake CAPTCHA lure and embedded URLs, indicating an attempt to trick the user into visiting a malicious site. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URIs and the fake CAPTCHA heuristic strongly suggest a phishing or social engineering attack vector, likely leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/case-clicker-roblox-money-hack-game-hack
    • https://www.shaillybeauty.com.au/uploaded_files/userfiles/files/how-to-hack-roblox-to-get-robux_GM431946152.pdf
    • https://www.shaillybeauty.com.au/uploaded_files/userfiles/files/coin-master-links-for-free-spins-2021_GM406889139.pdf
    • https://www.shaillybeauty.com.au/uploaded_files/userfiles/files/free-spins-and-coins-coin-master-link-2021_GM406889139.pdf
    • https://www.shaillybeauty.com.au/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • https://www.shaillybeauty.com.au/uploaded_files/userfiles/files/coin-master-free-spins-hack-iphone_GM406889139.pdf
    • https://www.shaillybeauty.com.au/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-haktuts_GM406889139.pdf
    • https://www.shaillybeauty.com.au/uploaded_files/userfiles/files/cpbildco-robux_GM431946152.pdf
    • https://www.shaillybeauty.com.au/uploaded_files/userfiles/files/hunting-rifle-hack-roblox-pastebin_GM431946152.pdf
    • https://www.shaillybeauty.com.au/uploaded_files/userfiles/files/how-to-hack-people-in-roblox_GM431946152.pdf
    • https://www.shaillybeauty.com.au/uploaded_files/userfiles/files/give-me-robux-now_GM431946152.pdf
    • https://www.shaillybeauty.com.au/uploaded_files/userfiles/files/watch-ads-for-robux_GM431946152.pdf
    • https://www.shaillybeauty.com.au/uploaded_files/userfiles/files/robux-now_GM431946152.pdf
    • https://www.shaillybeauty.com.au/uploaded_files/userfiles/files/tiktok-free-vs-paid_GM835599320.pdf
    • https://www.shaillybeauty.com.au/uploaded_files/userfiles/files/robux-gift-card-free_GM431946152.pdf
    • https://www.shaillybeauty.com.au/uploaded_files/userfiles/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdf
    • https://www.shaillybeauty.com.au/uploaded_files/userfiles/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdf
    • https://www.shaillybeauty.com.au/uploaded_files/userfiles/files/coin-master-hack-spins-ios_GM406889139.pdf
    • https://www.shaillybeauty.com.au/uploaded_files/userfiles/files/free-robux-codes-2021-real_GM431946152.pdf
    • https://www.shaillybeauty.com.au/uploaded_files/userfiles/files/coin-master-admin-free-spins_GM406889139.pdf
    • https://www.shaillybeauty.com.au/uploaded_files/userfiles/files/how-to-hack-a-minecraft-account_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052bc.bin
ce4dd4a0c5e8d314ab7aaa57ab79b3bda5842db09003dfc3f3bc8d5c4e9c8bee		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52BC 25052 bytes
font_01_sfnt_off00008c80.bin
9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C80 5596 bytes
font_02_sfnt_off00009927.bin
eb9637a732ff020d617acc8d3106aa291bd270ab34a7aad6876ca531e81adf97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9927 18676 bytes

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