Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a8ea9921403a91…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 19:41:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 920457f63c7ac34402b8372849f3558b SHA-1: c64135d62dfd4abb5c39e50af3660aa96ad8a4c2 SHA-256: 66a8ea9921403a914fae790fc9d771d5ca81cff6e0e938f86f2cbbfed9bb6853
62 Risk Score

Malware Insights

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

The document body and extracted URLs indicate a lure for free Robux, a virtual currency for the Roblox game. The presence of a download button lure and the ML classifier's high confidence score suggest this PDF is designed to trick users into downloading a secondary payload. The primary URL associated with the lure is http://netcdn.tw/app/431946152/free-robux-hack-no-verification-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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 http://netcdn.tw/app/431946152/free-robux-hack-no-verification-game-hack
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/coin-master-34-5-hack_GM406889139.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/how-to-get-free-spins-on-coin-master-2021-iphone_GM406889139.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/coin-master-free-coins-and-spins_GM406889139.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/dll-aimlock-hack-roblox_GM431946152.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/how-do-you-hack-roblox-money_GM431946152.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/free-roblox-card-code-generator-online_GM431946152.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/how-to-get-free-robux-without-any-verification_GM431946152.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/rbx-place-free-robux_GM431946152.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/roblox-robux-hack_GM431946152.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/coin-master-tiradas-gratis-link_GM406889139.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/minecraft-building-hacks_GM479516143.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/free-robux-no-verification-required_GM431946152.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/coin-master-hack-2021_GM406889139.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/free-robux-for-free_GM431946152.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/roblox-tycoon-simulator-script-hack_GM431946152.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/free-robux-redeem-codes_GM431946152.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/minecraft-free-reddit_GM479516143.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/minecraft-servers-that-allow-hacks_GM479516143.pdf
    • http://perpustakaan-pelita.sdnpercobaan2yogyakarta.com/repository/glitchtale-battle-of-souls-roblox-hack_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031a9.bin
1ed954b9b2a32e173aaf3ca2dc3d61c3a56b96d4e1c43a7dffca54ef9cb315ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x31A9 22164 bytes
font_01_sfnt_off000062b2.bin
96540bd7c84d60e769713d590412c745bf113fce47b0f54684cca50d2dde6ca8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B2 19244 bytes

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