Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05f49af6a688f5c…

MALICIOUS

PDF

35.6 KB Created: 2021-06-26 20:45:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1d02e34a3779f510172268f4ce2a7510 SHA-1: c7cb0b4e73786d45a134f7c783c7bb6cf4c34c03 SHA-256: b05f49af6a688f5c5868cb06e7d9c26de8f03b89d356f6dc0c26ad73996b4092
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains multiple embedded URLs and a prominent external URI pointing to sites offering game hacks and 'free Robux', indicating a lure for users to download potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of download button lures and callback phishing elements further support a malicious intent. No scripts were extracted from this sample.

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/free-robux-no-human-verification-2021-game-hack
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/coin-master-free-spins-link-today-ios_GM406889139.pdf
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/how-to-hack-roblox-account-on-phone_GM431946152.pdf
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdf
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/admin-roblox-hack-2021_GM431946152.pdf
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/roblox-land-free-robux_GM431946152.pdf
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/how-to-download-roblox-hack-tool_GM431946152.pdf
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/free-spins-coin-master-twitter_GM406889139.pdf
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/free-roblox-com_GM431946152.pdf
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/oprewards-com-robux_GM431946152.pdf
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/roblox-2021-hack_GM431946152.pdf
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/minecraft-tower-defense-2-hacked_GM479516143.pdf
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/roblox-promo-codes-free-robux_GM431946152.pdf
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/wahoo-gaming-roblox-free-robux_GM431946152.pdf
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/how-to-get-free-robux-2021-without-human-verification_GM431946152.pdf
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-today-2021-free_GM406889139.pdf
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/get-free-roblox-hack_GM431946152.pdf
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/how-to-get-free-robux-instantly_GM431946152.pdf
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/free-robux-yahoo-answers_GM431946152.pdf
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/roblox-promo-code-to-get-free-robux_GM431946152.pdf
    • https://www.kofordconverting.com/uploaded_files/userfiles/files/roblox-points_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000033b7.bin
90c5e2d2fc2143b891102b9a7290de2bca7800a811d16e9e0a7f623547bb680e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x33B7 21888 bytes
font_01_sfnt_off0000641a.bin
354295dcb16db07fec6852cf507e3dd09a8f39b1f712ecea2001cf8559992bf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x641A 19736 bytes

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