Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4caea0cac1f184c…

MALICIOUS

PDF

53.5 KB Created: 2021-06-02 10:37:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e19f19dc9ca6d1b9528134584efd4d32 SHA-1: 634a1134f200bea6ee45d229764e95ecc9b7255e SHA-256: f4caea0cac1f184cc6deab62f74a41492d49aba3d43d2ebf28deca31b00fcaf3
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 or human verification prompt, a common lure to trick users into downloading further malicious content. It contains an embedded URI pointing to a suspicious URL, likely serving as a download source for a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9577

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-vip-server-roblox-anime-battlegrounds-game-hack
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdf
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/games-for-robux_GM431946152.pdf
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdf
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/free-spins-coin-master-app_GM406889139.pdf
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/roblox-but_GM431946152.pdf
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdf
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/free-spins-for-coin-master-2021_GM406889139.pdf
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/what-pubg-uc-code_GM1330123889.pdf
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/coin-master-400-spin-link_GM406889139.pdf
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/who-to-get-free-robux_GM431946152.pdf
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/free-robux-on-ipad_GM431946152.pdf
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/roblox-bloxburg-hack_GM431946152.pdf
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdf
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/how-do-you-hack-roblox_GM431946152.pdf
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/free-minecraft-education-edition_GM479516143.pdf
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/minecraft-windows-10-free-code_GM479516143.pdf
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/free-spins-for-coin-master_GM406889139.pdf
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/download-minecraft-bedrock_GM479516143.pdf
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/get-free-spins-coin-master-october-2021_GM406889139.pdf
    • https://e-learning.mtsn1klaten.sch.id/__statics/gudangsoal/files/hacks-to-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000525c.bin
81b4724ae516f7586492fc8c80046c426fd9c3a8e11be8c223e37077af6d499a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x525C 25776 bytes
font_01_sfnt_off00008e77.bin
eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E77 2940 bytes
font_02_sfnt_off00009882.bin
f462303657ce1de10d3e7d5ae1fe17c8584116bd5bc216971166de87266da924		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9882 7272 bytes
font_03_sfnt_off0000a9f3.bin
d74ec51088b904b406b4e38176eab8277bcf66c936cdd43e3741a3483b8e74d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9F3 19684 bytes

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