Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c3d4f36803e26d…

MALICIOUS

PDF

34.8 KB Created: 2021-06-27 16:22:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 83af5b4dafdedf105c711209072c7ff2 SHA-1: bed51efc7b7b01bde6ae2ff4a010c9ae17232e7c SHA-256: 31c3d4f36803e26d343c4f771b4a313e03cb4a340d4f96ef0b1162e6b9412a21
62 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and text referencing game cheats and hacks, strongly suggesting a lure for users to download malicious software. The ML classifier also flagged this PDF with high confidence. The primary URL identified is http://netcdn.co/app/431946152/treasure-hunter-simulator-roblox-cheat-game-hack, which likely serves as the download source.

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.co/app/431946152/treasure-hunter-simulator-roblox-cheat-game-hack
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/coin-master-hack-to-get-free-spins_GM406889139.pdf
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/how-to-change-your-name-on-roblox-for-free_GM431946152.pdf
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-spin-generator-for-coin-master_GM406889139.pdf
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/coin-master-email-free-spins_GM406889139.pdf
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/roblox-hackclub-2021_GM431946152.pdf
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdf
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/try-minecraft-free_GM479516143.pdf
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/roblox-credit-card-hack-2021_GM431946152.pdf
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/roblox-hacked-com-2021_GM431946152.pdf
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/lemonaid-hack-roblox_GM431946152.pdf
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/minecraft-free-download-laptop_GM479516143.pdf
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-coins_GM406889139.pdf
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/working-coin-master-hack_GM406889139.pdf
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdf
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/optifine-minecraft-pe_GM479516143.pdf
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/websites-that-give-free-robux_GM431946152.pdf
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/free-back-accessories-roblox_GM431946152.pdf
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/roblox-hack-download-xbox-one_GM431946152.pdf
    • https://www.decorsofacile.com/uploaded_files/userfiles/files/roblox-hacked-on-march-18_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000307d.bin
f99202ca08fcd699a8a3ece61eeb663fbbe41f2ffbb7601901d75b51a7c26a15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x307D 22404 bytes
font_01_sfnt_off00006281.bin
e0133f980b29d6f9a3a51e61ada351d4c0d60e1415697a8da5c9a3b8782f0eff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6281 19276 bytes

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