Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a077d70716c33c…

MALICIOUS

PDF

50.0 KB Created: 2021-05-12 02:02:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: df8a036af73b1aa58083802c0bf5e191 SHA-1: ccf9439243fa39f7bf93cb5c7c6f0755212678cf SHA-256: c9a077d70716c33c83290a76a4c8162489cae7c7f0522ed77a84f2629148ad34
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or verification prompt to trick the user into interacting with a malicious link. The embedded URL, https://netcdn.xyz/app/431946152/free-robux-hack-game-hack, is likely a download or redirect to a second-stage payload. No scripts were extracted, but the PDF structure and heuristics suggest a client-side exploitation or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8594

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-hack-game-hack
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/free-minecraft-survival-server_GM479516143.pdf
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/hey-google-how-do-you-get-free-robux_GM431946152.pdf
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/free-robux-generator-2021_GM431946152.pdf
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/earn-robux_GM431946152.pdf
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/minecraft-hack-mod_GM479516143.pdf
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/coin-master-hack-without-verification-2021_GM406889139.pdf
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/minecraft-hack-client-18-9_GM479516143.pdf
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/free-robux-games_GM431946152.pdf
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/robux-websites-2021_GM431946152.pdf
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/minecraft-toolbox-premium-apk_GM479516143.pdf
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/coin-master-hack-no-verification-2021_GM406889139.pdf
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/free-spin-coin-master-2021-link_GM406889139.pdf
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/how-to-sue-roblox_GM431946152.pdf
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/how-to-duplicate-coin-master-spin-hack_GM406889139.pdf
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/free-robux-for-kids-no-verification_GM431946152.pdf
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/robux-free-com_GM431946152.pdf
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/get-robux_GM431946152.pdf
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/roblox-hacked-version_GM431946152.pdf
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/free-minecraft-videos_GM479516143.pdf
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/minecraft-windows-10-code-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b63.bin
ad75dd050c549a621ca10640fdf723dddca2f8d1b938e65927e1c4a2a1eeadc7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B63 26540 bytes
font_01_sfnt_off00008961.bin
eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8961 2940 bytes
font_02_sfnt_off0000936c.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x936C 5696 bytes
font_03_sfnt_off0000a07e.bin
8090616d8a5c0701bec53dfbbcc7430816d9db69864bd7c9067c717eb12c26b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA07E 18412 bytes

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