Malicious PDF — malware analysis report

Static analysis result for SHA-256 327806226671ac0d…

MALICIOUS

PDF

44.8 KB Created: 2021-05-13 12:35:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0d8528e3835727cb5a21530e82904268 SHA-1: ac26dff13f43c429b212b00e45ed2195871f2b2f SHA-256: 327806226671ac0dcf2894603dc137225831765818b404bd35f3bf3f5049f0a7
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a fake CAPTCHA lure, which is a common social engineering tactic to trick users into downloading malicious content. The embedded URL, https://netcdn.xyz/app/431946152/free-robux-2021-no-human-verification-game-hack, likely serves as the download source for a secondary payload. The ML classifier also strongly indicated maliciousness.

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/free-robux-2021-no-human-verification-game-hack
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/minecraft-rtx-download-free_GM479516143.pdf
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/games-that-give-free-robux_GM431946152.pdf
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/hack-coin-master-apk-download_GM406889139.pdf
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/roblox-group-free-robux_GM431946152.pdf
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/free-robux-no-verification-2021-ios_GM431946152.pdf
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/free-dominus-roblox_GM431946152.pdf
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/a-lot-of-robux_GM431946152.pdf
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/free-spins-coin-master-2021_GM406889139.pdf
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/como-hackear-coin-master-espaol_GM406889139.pdf
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/coin-master-free-spins-hack_GM406889139.pdf
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/hack-xp-net-coin-master_GM406889139.pdf
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/coin-master-free-spins-app_GM406889139.pdf
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-twitter_GM406889139.pdf
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/how-can-i-get-free-robux_GM431946152.pdf
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/coin-master-free-spins-activegamer_GM406889139.pdf
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/coin-master-links-for-free-spins_GM406889139.pdf
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/huskybuscom-free-robux_GM431946152.pdf
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/free-robux-redeem-codes-2021_GM431946152.pdf
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/real-coin-master-hacks_GM406889139.pdf
    • https://www.elearning.massimbangkulon.sch.id/__statics/gudangsoal/files/coin-master-spins-for-free_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b63.bin
3fd73d64148593f730939d8834618366397bcc0246eb481ca36266fb4d2bdc70		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B63 27596 bytes
font_01_sfnt_off000089ff.bin
a5b009a33d06eb91b5687aca452054299973906144ac3f9b2fc2dd0e2fef1dac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89FF 19260 bytes

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