Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ca50be30f15e7c…

MALICIOUS

PDF

49.0 KB Created: 2021-06-09 16:12:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c238ccaff4fd931e45ba446fecb6b3a7 SHA-1: 1240371d278bfe07c41f9a7a828cbca1107c4156 SHA-256: d1ca50be30f15e7c036d773621fa8c47f86bf6fb8849b39470e659a4a0605679
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and text that lure the user into downloading a file by promising free Robux. The heuristic SE_LOLBIN_RUN_COMMAND suggests the document may attempt to execute commands, likely to download and run a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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-hack-may-2021-game-hack
    • http://lib.smklabor.sch.id/repository/snip-roblox-hack_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/roblox-hack-cleant-jailbraik_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/robux-no-human-verification_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/daily-free-spins-on-coin-master_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/roblox-images_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/roblox-piano-hack_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/minecraft-pocket-edition-free-apk_GM479516143.pdf
    • http://lib.smklabor.sch.id/repository/free-2021-robux_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/how-to-hack-roblox-using-cmd_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/free-spins-on-coin-masters_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/free-robux-no-human-verification-no-survey-no-offer_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/coin-master-ios-gods-hack_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/coin-master-free-spin-ml_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/free-free-robux_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/intriga-roblox-hack_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdf
    • http://lib.smklabor.sch.id/repository/tiktok-free-skin-ml_GM835599320.pdf
    • http://lib.smklabor.sch.id/repository/roblox-com-hack_GM431946152.pdf
    • http://lib.smklabor.sch.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • https://robuxhaxs.com
    • http://lib.smklabor.sch.id/repository/fr
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053af.bin
b9aa0bd11829fff23149a911d692688abae6efc603fbec98cbb1288b3aeda215		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53AF 25996 bytes
font_01_sfnt_off0000906c.bin
1970cd915475d889ba3d30313812de421518e9eaff36eb9150e360805bb27040		 pdf-font-stream PDF embedded font (sfnt) at offset 0x906C 2868 bytes
font_02_sfnt_off00009a4e.bin
835e979affb9b69e2d56ed2956017f1d1f7db1d36032b1234cc9d7e88aa52345		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A4E 19192 bytes

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