Malicious PDF — malware analysis report

Static analysis result for SHA-256 823b64fb2270d240…

MALICIOUS

PDF

46.2 KB Created: 2021-05-16 22:03:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ee18a132f8e66562b3cd0e44f9b3c8e5 SHA-1: 7df80d4d305da83db39e2ab5a4cf65cc57f587a5 SHA-256: 823b64fb2270d24038b00cd55811dad4d51d5b4d4a5d26a512401c7fcf0e5bf9
142 Risk Score

Malware Insights

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

This PDF document employs social engineering tactics by presenting a fake CAPTCHA and a "download" button to trick users into believing they need to verify their humanity or download a tool. The document explicitly requests sensitive recovery secrets or private keys, indicating a phishing or credential harvesting attempt. The embedded URI and numerous other URLs point to external resources, likely hosting the actual malicious payload or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.xyz/app/431946152/how-to-hack-roblox-accounts-2021-game-hack
    • http://yochin.org.tw/images/how-to-get-roblox-premium-for-free-2021_GM431946152.pdf
    • http://yochin.org.tw/images/roblox-studio-free-robux_GM431946152.pdf
    • http://yochin.org.tw/images/easy-robux-hack_GM431946152.pdf
    • http://yochin.org.tw/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdf
    • http://yochin.org.tw/images/free-robux-no-human-verification-no-survey_GM431946152.pdf
    • http://yochin.org.tw/images/roblox-hack-download_GM431946152.pdf
    • http://yochin.org.tw/images/minecraft-free-ios-no-verification_GM479516143.pdf
    • http://yochin.org.tw/images/easy-free-spins-coin-master_GM406889139.pdf
    • http://yochin.org.tw/images/roblox-robux-hack-generator_GM431946152.pdf
    • http://yochin.org.tw/images/free-robux-videos_GM431946152.pdf
    • http://yochin.org.tw/images/free-spin-link-coin-master_GM406889139.pdf
    • http://yochin.org.tw/images/coin-master-free-spin-trick_GM406889139.pdf
    • http://yochin.org.tw/images/minecraft-app-free-download_GM479516143.pdf
    • http://yochin.org.tw/images/no-human-verification_GM431946152.pdf
    • http://yochin.org.tw/images/free-spins-for-coin-master-2021_GM406889139.pdf
    • http://yochin.org.tw/images/roblox-free-hats_GM431946152.pdf
    • http://yochin.org.tw/images/wahoogaming-co-free-robux_GM431946152.pdf
    • http://yochin.org.tw/images/get-free-robux-without-human-verification_GM431946152.pdf
    • http://yochin.org.tw/images/free-robux-meme_GM431946152.pdf
    • http://yochin.org.tw/images/free-roblox-gift-card-codes_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a05.bin
c86c8af9b799eb4f50d735c7a250a1598700c66025df0928975948ae348953e5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A05 26172 bytes
font_01_sfnt_off000085bc.bin
3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85BC 2840 bytes
font_02_sfnt_off00008f6e.bin
91904dcb98687fcf58c7b52e545a9fbf658b3e4d1998331468638ebaf1d03505		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6E 18992 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.