Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd92d8904a8288ff…

MALICIOUS

PDF

44.2 KB Created: 2021-05-10 17:01:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7d562dd83939561fcd99d4303ca44b44 SHA-1: 9290160437bf85d9a2071f450ff9d0d209600ec5 SHA-256: fd92d8904a8288ff6805f3936ed3321623c2d22faa63e7c56717fd7d2319bf24
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 external URIs, including one pointing to a potential download site. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/huskybus.com-free-robux-game-hack
    • https://elearning.maalhidayah.com/__statics/gudangsoal/files/coin-master-hack-without-verification-code_GM406889139.pdf
    • https://elearning.maalhidayah.com/__statics/gudangsoal/files/free-spin-and-coin-blogspot_GM406889139.pdf
    • https://elearning.maalhidayah.com/__statics/gudangsoal/files/daily-spin-and-coin_GM406889139.pdf
    • https://elearning.maalhidayah.com/__statics/gudangsoal/files/card-hack-for-coin-master_GM406889139.pdf
    • https://elearning.maalhidayah.com/__statics/gudangsoal/files/free-coin-master-spins-2021_GM406889139.pdf
    • https://elearning.maalhidayah.com/__statics/gudangsoal/files/is-minecraft-earth-free_GM479516143.pdf
    • https://elearning.maalhidayah.com/__statics/gudangsoal/files/coinmasterfreespinlink_GM406889139.pdf
    • https://elearning.maalhidayah.com/__statics/gudangsoal/files/how-to-get-free-robux-easy_GM431946152.pdf
    • https://elearning.maalhidayah.com/__statics/gudangsoal/files/how-many-levels-are-there-in-coin-master_GM406889139.pdf
    • https://elearning.maalhidayah.com/__statics/gudangsoal/files/minecraft-hacks-18-9_GM479516143.pdf
    • https://elearning.maalhidayah.com/__statics/gudangsoal/files/coin-master-hack-software_GM406889139.pdf
    • https://elearning.maalhidayah.com/__statics/gudangsoal/files/10-free-spins-coin-master_GM406889139.pdf
    • https://elearning.maalhidayah.com/__statics/gudangsoal/files/free-robux-gift-card-codes_GM431946152.pdf
    • https://elearning.maalhidayah.com/__statics/gudangsoal/files/how-do-you-hack-minecraft_GM479516143.pdf
    • https://elearning.maalhidayah.com/__statics/gudangsoal/files/earn-points-for-robux_GM431946152.pdf
    • https://elearning.maalhidayah.com/__statics/gudangsoal/files/free-robux-generator-for-roblox-2021_GM431946152.pdf
    • https://elearning.maalhidayah.com/__statics/gudangsoal/files/coin-master-twitter_GM406889139.pdf
    • https://elearning.maalhidayah.com/__statics/gudangsoal/files/how-to-hack-coin-master-using-es-filer_GM406889139.pdf
    • https://elearning.maalhidayah.com/__statics/gudangsoal/files/free-robux-with-no-human-verification_GM431946152.pdf
    • https://elearning.maalhidayah.com/__statics/gudangsoal/files/robux-com-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049c7.bin
940af891bd8bd2ccfa46e9b2ec361a30ce091b4a8be622d154c8056d33ff1e77		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49C7 28080 bytes
font_01_sfnt_off00008988.bin
6add98f93d6464e4673e157e466f8eac90a499b9ef5784f234ada041ea0169f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8988 18688 bytes

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