Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9731a68d68c133…

MALICIOUS

PDF

35.4 KB Created: 2021-06-22 07:12:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 413e4a0c1cc937a96f7da7b4be919140 SHA-1: 80f1677309af5ba9b6f77a785a0c3658525084d3 SHA-256: 1f9731a68d68c1332ed265fa35e8228b365533817b282ed6f1711bddbd73991f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1059.003 Windows Command Shell

The document uses a lure of "free Robux" and "free coins" to trick users into downloading a payload from the URL http://netcdn.co/app/431946152/hack-roblox-robux-cheat-game-hack. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document likely instructs users to paste commands into a shell, suggesting an attempt to execute downloaded malware. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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/hack-roblox-robux-cheat-game-hack PDF link annotation
    • https://www.similar.com.tw/upload/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-robux-claim-free-robux_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/como-ser-hacker-en-roblox-sin-descargar-nada_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/someone-has-hacked-into-my-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/microsoft-roblox-rewards_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-robux-legit_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-coin-master-account_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/hack-download_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/free-unused-roblox-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coin-spin_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.similar.com.tw/upload/files/coin-master-free-rewards-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3505 21932 bytes
SHA-256: d748786bddb46ffde0d7a408cef24436901264749cfa0bfa19d6949176ce40aa
font_01_sfnt_off00006542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6542 19064 bytes
SHA-256: abcec8ca1709209c7b801fca3506483b3f6a382c6921386466def715ba78952f