Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f22a891c3fb9819…

MALICIOUS

PDF

45.8 KB Created: 2021-06-11 03:06:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e90a1176fac991efeb83cf974de142b2 SHA-1: 1392ff405a421ddc9d53369c71ea111af8bb778f SHA-256: 3f22a891c3fb981978aa85c00eeca9009335cf01a8c00f681156b9a211637a23
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document that presents a fake CAPTCHA to the user, a common lure to encourage interaction. It contains an embedded URI pointing to a suspicious URL, which is likely intended to host a secondary payload. The ML classifier also flagged this PDF as malicious with high confidence.

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-apk-hack-ios-game-hack PDF link annotation
    • https://lib.btkljogja.or.id/repository/beyond-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-hack-tool-india_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-roblox-money_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-do-you-gift-people-robux-for-free_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/robux-cheats-2021_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/telecharger-hack-pour-roblox-mad-city_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-rs-in-roblox_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-spins-coin-master-links-twitter_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/roblox-avatar-editor-free_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/https-rbx-place-rewards_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-hack-roblox-account-february_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/roblox-gba-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000517c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x517C 27404 bytes
SHA-256: 71822c9581f020ceefa3834f772de21f6ac70b0a748bea9a56b95d0992cfe577
font_01_sfnt_off0000903b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x903B 18356 bytes
SHA-256: 1bde106c75d5a6ddde6121ffe9672fa83f81d0f8a293091439e53c01756f62b6

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