Malicious PDF — malware analysis report

Static analysis result for SHA-256 da989b485eba921b…

MALICIOUS

PDF

48.8 KB Created: 2021-05-10 20:11:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6e4ffe39f383d985e2cd0f3eecbfcbbc SHA-1: bbae417ebcf74e99ffa203ce75a1e96525ef07cb SHA-256: da989b485eba921b497aac9e52dbab218a35df1f9cf401907bd44c508a3b2f0b
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with the document. It also embeds an external URI pointing to a suspicious URL, likely intended to download a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9228

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/free-robux-earn-game-hack
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/how-to-get-free-minecraft-skins_GM479516143.pdf
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/easy-robux-generator_GM431946152.pdf
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-and-coins-link_GM406889139.pdf
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/free-coin-master-spins-for-today_GM406889139.pdf
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/good-free-minecraft-server-hosting_GM479516143.pdf
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/coin-master-hack-online-download_GM406889139.pdf
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/roblox-help-free-robux_GM431946152.pdf
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/hack-minecraft_GM479516143.pdf
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/minecraft-cheats-switch_GM479516143.pdf
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/free-robux-generator-no-verification_GM431946152.pdf
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/minecraft-bedrock-edition-download-pc-free_GM479516143.pdf
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/roblox-shirt-template-free_GM431946152.pdf
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/hack-coin-master-download-ios_GM406889139.pdf
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/free-robux-generator-codes_GM431946152.pdf
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/free-minecraft-account-list_GM479516143.pdf
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/no-verification-coin-master-hack_GM406889139.pdf
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/free-coin-master-spins-and-coins_GM406889139.pdf
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/roblox-booga-booga-hack_GM431946152.pdf
    • http://elearning.min13bm.sch.id/__statics/gudangsoal/files/coin-coin-master-hack_GM406889139.pdf
    • https://elearning.min13bm.sch.id/__statics/gudangsoal/files/coin-master-free-spins-hack-ios_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004e34.bin
d977ec6afda7ef9749561a714830e2dfb7a59541154eb94f8eac4eedf42991c9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E34 30196 bytes
font_01_sfnt_off000092d4.bin
a66b570a908761b39e6d9e18bcb667c353840a86c6a7db528f79d01abe6b23a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92D4 2844 bytes
font_02_sfnt_off00009c7b.bin
b6014a1bf70a80b5b7176295bd11553985cf3fccea183fb301f46a2e8db4226f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C7B 18244 bytes

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