Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e8a83f3e03fa1f…

MALICIOUS

PDF

48.4 KB Created: 2021-06-07 13:34:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: cd624a1fa5e5a75ac6121bf0c9150110 SHA-1: 93b82f91daa82f90118daa3f9496c8c212815909 SHA-256: 43e8a83f3e03fa1fab057aa09c4f4c307346d077699525f434dedb11ddc93ba4
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded URI pointing to a suspicious URL, and a heuristic identified it as a lure for MFA or one-time code harvesting. The document body, though heavily obfuscated, contains references to game hacks and free items, suggesting a social engineering pretext. The presence of multiple external links further supports the malicious intent of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/captain-underpants-roblox-free-game-game-hack
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/working-coin-master-hack-2021_GM406889139.pdf
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/can-you-play-minecraft-for-free_GM479516143.pdf
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/coin-master-free-spin-link-daily_GM406889139.pdf
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/real-free-robux-codes_GM431946152.pdf
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/coin-master-hack-mod-apk_GM406889139.pdf
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/daily-free-spins-coin-master-2021_GM406889139.pdf
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/free-coins-for-flip-master_GM406889139.pdf
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/free-robux-2021-no-verification_GM431946152.pdf
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/fake-robux-codes_GM431946152.pdf
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/rbx-earn_GM431946152.pdf
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/minecraft-online-free-download_GM479516143.pdf
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/coin-master-free-spins-2021-hack_GM406889139.pdf
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdf
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/coin-master-free-spins-link_GM406889139.pdf
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/roblox-hack-me-robux_GM431946152.pdf
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/freerobux-co_GM431946152.pdf
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/coin-master-free-coins-hack_GM406889139.pdf
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/how-to-get-coin-master-card-free_GM406889139.pdf
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/how-to-become-pubg-uc-seller_GM1330123889.pdf
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/how-can-u-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005435.bin
1e6a755a57135fe420d6af338040c8daecd2beec62dd0dc9c6e02dd7edc5bc73		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5435 24972 bytes
font_01_sfnt_off00008e2a.bin
972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E2A 2820 bytes
font_02_sfnt_off000097ca.bin
0b5775edf724a68a9fac9a0fc8aaaddfc4dc8fe1baffc38c72f1f07890e1a7a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97CA 19196 bytes

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