Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cb9ffcf251b62c…

MALICIOUS

PDF

43.6 KB Created: 2021-05-15 04:30:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6a023bd19413eb0b263c37d74893be5b SHA-1: 032cbf82a87523bf8ee55e904ff90e16eaad9df2 SHA-256: d9cb9ffcf251b62c07c5fd8704268314f0738270bcd5eacf5f4ae622ff2cb73c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document uses a lure of "Free Robux Generator" to entice users to click on an embedded URL, which likely leads to a malicious download. The presence of a password archive lure heuristic suggests that the downloaded content may be encrypted to evade initial security checks. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/free-robux-generator-no-human-verification-or-survey-2021-game-hack
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-hack_GM406889139.pdf
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/spin-coin-master-hack_GM406889139.pdf
    • http://smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/roblox-promo-code-to-get-free-robux_GM431946152.pdf
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/free-robux-app_GM431946152.pdf
    • http://smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/free-links-coin-master_GM406889139.pdf
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/how-to-downgrade-minecraft-pe_GM479516143.pdf
    • http://smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdf
    • http://smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/mcpe-com_GM479516143.pdf
    • http://smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdf
    • http://smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/free-robux-com-2021_GM431946152.pdf
    • http://smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/best-way-to-get-free-robux_GM431946152.pdf
    • http://smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/wizard-hacks_GM479516143.pdf
    • http://smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/free-robux-codes-2021_GM431946152.pdf
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/coin-master-pro-hack_GM406889139.pdf
    • http://smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/more-robux_GM431946152.pdf
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-today-hack_GM406889139.pdf
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/free-bobux_GM431946152.pdf
    • http://smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/hack-coin-master-mod-apk_GM406889139.pdf
    • http://smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/roebucks-on-roblox_GM431946152.pdf
    • http://smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bf7.bin
7a8ab46a688e424f08889ed179697ead66426677ba11a876b1ad55e68d5978ec		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BF7 24428 bytes
font_01_sfnt_off00008410.bin
3a60cdb248c638d1e974f8488a9d0c49865e0dbecbd8cc682acbe36144e2e86e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8410 19556 bytes

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