Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a462f9e4a11d30a…

MALICIOUS

PDF

44.5 KB Created: 2021-05-10 23:40:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4fc782a1683cec651f0730dc6d52b981 SHA-1: a680f3d64693477147102387241a7bf67a3da8b2 SHA-256: 3a462f9e4a11d30a3229174186502f0354ce3281b8722ac5b7d71e454d7945c3
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document contains a lure for account recovery secrets, combined with embedded URLs pointing to potentially malicious download sites. The ML classifier also flagged this PDF as malicious. The presence of external URIs and the recovery secret lure strongly suggest an attempt to trick the user into downloading a second-stage payload, likely related to credential theft or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 4

  • 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.
  • 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/406889139/coin-master-hack-cydia-game-hack
    • http://armatrutz.de/images/coin-master-free-spins-hack_GM406889139.pdf
    • http://armatrutz.de/images/coin-master-gift-link_GM406889139.pdf
    • http://armatrutz.de/images/download-minecraft-bedrock_GM479516143.pdf
    • http://armatrutz.de/images/coin-master-free-spins-april-2021_GM406889139.pdf
    • http://armatrutz.de/images/aternos-free-minecraft-server_GM479516143.pdf
    • http://armatrutz.de/images/free-group-roblox_GM431946152.pdf
    • http://armatrutz.de/images/bux-life-free-robux_GM431946152.pdf
    • http://armatrutz.de/images/coin-master-app-for-free-spins_GM406889139.pdf
    • http://armatrutz.de/images/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdf
    • http://armatrutz.de/images/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdf
    • http://armatrutz.de/images/free-draw-roblox_GM431946152.pdf
    • http://armatrutz.de/images/roblox-games-that-give-you-free-robux_GM431946152.pdf
    • http://armatrutz.de/images/free-coins-and-spins-in-coin-master_GM406889139.pdf
    • http://armatrutz.de/images/coin-master-free-spins-hack-ios_GM406889139.pdf
    • http://armatrutz.de/images/codes-how-to-get-free-robux_GM431946152.pdf
    • http://armatrutz.de/images/feb-23-2021-free-coin-master-spins_GM406889139.pdf
    • http://armatrutz.de/images/free-coins-and-spins-for-coin-master_GM406889139.pdf
    • http://armatrutz.de/images/how-to-actually-get-free-robux_GM431946152.pdf
    • http://armatrutz.de/images/coin-master-free-spins_GM406889139.pdf
    • http://armatrutz.de/images/coin-master-free-spins-hack-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004928.bin
2b94009ee4618577931a3a3d72072eb788a5d5d0155a6c94b8d468ffb1760543
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4928 25300 bytes
font_01_sfnt_off000081f1.bin
3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
pdf-font-stream PDF embedded font (sfnt) at offset 0x81F1 2840 bytes
font_02_sfnt_off00008ba2.bin
4738d241759e4cff2f8f871975220420d30bcacc60cdf6fe40909b1f8f62f8b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA2 18072 bytes