Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef75552c3f93002e…

MALICIOUS

PDF

45.8 KB Created: 2021-06-11 02:42:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 84f56f921cb45bb0b293057a43064e9f SHA-1: 1612e42c21834d43e49875d72dbc79fd638af78d SHA-256: ef75552c3f93002e20d03b85ef6e33ee9a1e2570977dcf3d42e944ceb41e54e7
82 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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-999.999-robux-2021-android-game-hack PDF link annotation
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-outfits-on-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-redeem-code-for-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-many-free-spin-links-is-there-for-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/its-free-roblox-logo_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-without-human-verification-on-phone_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/hacking-s-roblox-account_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-meme-hack-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/bleu-roblox-mega-free_GM431946152.pdfIn PDF document text
    • https://www.communes.comIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050fb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50FB 26700 bytes
SHA-256: 04ee2a58e1c4899f541b655ca4464107a04e5f5e1b23a9c944ccc2a5ba81b462
font_01_sfnt_off00008d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5A 19248 bytes
SHA-256: 9dc32807907a68f0a7f0d86ef68ccf8124e385b39a69b9a9ed381f4e6e9ba028

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