Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f2f05b5ac3cb7a…

MALICIOUS

PDF

48.1 KB Created: 2021-06-11 08:18:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1ed5c9b10b6162d0a5357c2ece16364b SHA-1: e56eb9e89e0ec1f1b37f1d79b6ef40cebaf5dc1e SHA-256: a3f2f05b5ac3cb7aeec62724f3762a4c1359e73bf9b3a0a8764337b8ef1565ee
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 to trick the user into interacting with it. It contains an embedded URI pointing to a website that likely hosts a malicious payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.tw/app/431946152/roblox-hack-robux-hack-game-hack
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/coin-master-links-free-spins_GM406889139.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/coin-master-hacks-2021_GM406889139.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/roblox-catalog-free-items_GM431946152.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/free-robux-codes-generator_GM431946152.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/websites-that-give-free-robux_GM431946152.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-mobile_GM431946152.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/rbx-land-free-robux_GM431946152.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/minecraft-pe-hacks_GM479516143.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-download_GM406889139.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/free-roblox-hack-us_GM431946152.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/free-minecraft-skins_GM479516143.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-links-2021_GM406889139.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/free-promo-codes-roblox_GM431946152.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/free-avatar-roblox_GM431946152.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/master-coin-hack-app_GM406889139.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/free-printable-roblox-images_GM431946152.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/update-coin-master-free-spins_GM406889139.pdf
    • https://learning.min1rembang.sch.id/__statics/gudangsoal/files/free-minecraft-accounts-2021_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051dd.bin
5bdc1fa67d72a8b3111697d396eab504a0e90741049c6832e65ceada72d63e1f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51DD 30168 bytes
font_01_sfnt_off0000998b.bin
9fabd93bf80786fef7106cf90143d9a17a4f739f1910936e612b598f470ae871		 pdf-font-stream PDF embedded font (sfnt) at offset 0x998B 18320 bytes

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