Malicious PDF — malware analysis report

Static analysis result for SHA-256 244454871d353e0c…

MALICIOUS

PDF

44.7 KB Created: 2021-06-03 20:05:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4ab1850ec1bcd3f00322982078668a06 SHA-1: 06d368abf0822c4874c2055dd5d9a16331cb34a7 SHA-256: 244454871d353e0ce41c7dee99074c37ac5713f1cf1c7251a776cf9897d5fd9b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for game cheats, specifically for 'Coin Master', directing users to download a file from a suspicious URL. The presence of a visual download button and instructions for password-protected archives suggests a multi-stage attack designed to bypass security measures. Although no scripts were directly extracted, the ML classifier and embedded URL heuristics strongly indicate malicious intent, likely to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.online/app/406889139/coin-master-unlimited-spin-link-game-hack
    • http://library.yamasi.ac.id/repository/free-minecraft-java-edition_GM479516143.pdf
    • http://library.yamasi.ac.id/repository/minecraft-clipart-free_GM479516143.pdf
    • http://library.yamasi.ac.id/repository/free-spins-coin-master-2021-today_GM406889139.pdf
    • http://library.yamasi.ac.id/repository/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdf
    • http://library.yamasi.ac.id/repository/free-spins-on-coin-master-hack_GM406889139.pdf
    • http://library.yamasi.ac.id//repository/coin-master-hack-version-apk-download_GM406889139.pdf
    • http://library.yamasi.ac.id/repository/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.pdf
    • http://library.yamasi.ac.id//repository/hack-avatar_GM431946152.pdf
    • http://library.yamasi.ac.id//repository/free-spins-coin-master-links_GM406889139.pdf
    • http://library.yamasi.ac.id/repository/roblox-invitations-free_GM431946152.pdf
    • http://library.yamasi.ac.id//repository/coin-master-daily-rewards_GM406889139.pdf
    • http://library.yamasi.ac.id/repository/unlimited-free-spins-coin-master_GM406889139.pdf
    • http://library.yamasi.ac.id//repository/free-minecraft-account-and-password-2021_GM479516143.pdf
    • http://library.yamasi.ac.id//repository/minecraft-pe-free-ios_GM479516143.pdf
    • http://library.yamasi.ac.id//repository/50-free-spins-coin-master_GM406889139.pdf
    • http://library.yamasi.ac.id/repository/minecraft-free-download-laptop_GM479516143.pdf
    • http://library.yamasi.ac.id/repository/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdf
    • http://library.yamasi.ac.id//repository/free-robux-without-verification_GM431946152.pdf
    • http://library.yamasi.ac.id//repository/cm-free-spins_GM406889139.pdf
    • http://library.yamasi.ac.id/repository/how-to-get-free-robux-without-email_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000533f.bin
7f4edbef1e7936ab6dc1249fa667c37c8bbd51a8f5923262217c18080ce9c69f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x533F 24404 bytes
font_01_sfnt_off00008b29.bin
4b9e97571f76fbd37980e49efa03e4d0776fec80245dbf17b6cc6ba6596e58ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B29 18584 bytes

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