Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75b509c464da739…

MALICIOUS

PDF

41.8 KB Created: 2021-05-12 21:32:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f14a73910582109ae589e4ecd848e11a SHA-1: 4ab3f5132a9ed8e0d4606299549979943d6b8bcf SHA-256: a75b509c464da7395bc676220a4d693857c55f5ffa9c348d5a9c613eb9b68f93
82 Risk Score

Malware Insights

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

The sample is a PDF document that displays a fake CAPTCHA to trick the user into interacting with it, likely to initiate a download. The embedded URL `https://netcdn.xyz/app/431946152/roblox-earn-robux-game-hack` is a strong indicator of malicious intent, suggesting the document is a lure for a malicious download. No scripts were extracted, but the presence of a fake CAPTCHA and a download link points towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/roblox-earn-robux-game-hack
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/coin-master-fan-page-free-spins_GM406889139.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/free-robux-no-survey_GM431946152.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/roblox-bloxburg-hack_GM431946152.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/how-to-install-minecraft-for-free_GM479516143.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master-hack_GM406889139.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/roblox-hacks-com_GM431946152.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/free-minecraft-bedrock_GM479516143.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/best-free-roblox-executor_GM431946152.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/master-8-ball-pool-free-coins_GM406889139.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/legitimate-coin-master-free-spins-apk_GM406889139.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/minecraft-java-hacks_GM479516143.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-hack_GM431946152.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/coinmaster-spin-ml_GM406889139.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/how-to-actually-get-free-robux_GM431946152.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/roblox36com-free-robux_GM431946152.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/free-roblox-hack_GM431946152.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/minecraft-server-free-trial_GM479516143.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/minecraft-hack-ios_GM479516143.pdf
    • http://elearning.mtsn2lamsel.sch.id/__statics/gudangsoal/files/get-minecraft-windows-10-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a67.bin
af0c0545bd668b9ab39388207e2be57d43a5970cee96021a52a29c14e6683e10		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A67 24116 bytes
font_01_sfnt_off00008174.bin
ac560818c0950b36a4d7f23f452e83199291727370614d0236bf7521a0e82fc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8174 18152 bytes

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