Malicious PDF — malware analysis report

Static analysis result for SHA-256 100c1e8cffd3d4d5…

MALICIOUS

PDF

48.2 KB Created: 2021-06-09 13:48:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a8ef05c07e428790650a9edaf4d7831b SHA-1: aa7850f30fcf52974d4fb59ff52a19bc069a2ab6 SHA-256: 100c1e8cffd3d4d520cad02f7d6b98c1f349ac0b5b41fef8a46bbaac4522f19e
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1203 Exploitation for Client Execution

The PDF contains a lure for "Free Robux" and explicitly instructs the user to copy and paste content into a command-line interface, indicating an attempt to trick the user into executing malicious commands. The embedded URL and numerous other URLs point to potentially malicious content, likely a second-stage payload. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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 https://netcdn.tw/app/431946152/free-robux-form-watch-ads-game-hack PDF link annotation
    • http://pesok-rk.ru/images/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/cheat-phantom-forces-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/hallows-eve-2021-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/play-roblox-for-free-on-google_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://pesok-rk.ru/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/coin-master-daily-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/coin-master-free-link-daily_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/roblox-adopt-me-free-ride_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-old-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/make-free-robux_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/robux-free-com_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/minecraft-nintendo-switch-digital-code-free_GM479516143.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
stream_004_off00004f32.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F32 31264 bytes
SHA-256: 522249df342f3eb35783deea299f7ba92b3dcf6a75b1378b793f21282f1da6db
font_01_sfnt_off00009764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9764 19144 bytes
SHA-256: 2fcf28c0c99c17bd78aed1be5493e8cc6f5236f1a2285accc86d90a853cb5e00

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