Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4b0b263eb24e8d…

MALICIOUS

PDF

48.2 KB Created: 2021-06-08 21:29:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c0f09729888000fcf114b0375aca4f9c SHA-1: e44d01451ec5fb40f5440c1968c1a2d65a9214fa SHA-256: 6b4b0b263eb24e8d6bd982e65b4e9d199d320ce54f0661050ae998fb6ce7d395
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and 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 0.9796

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/how-to-hack-without-downloading-anything-roblox-game-hack PDF link annotation
    • http://lib.smklabor.sch.id/repository/how-to-give-free-robux-to-friends_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/spinuri-gratis-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/best-roblox-hacks-2021-hand_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/getrobux-ninja_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/whats-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hack-roblox-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/completed-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-spins-daily-link-updated_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-free-robux-claimer_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-gold-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-kohls-admin-house-hack-script_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51E3 25324 bytes
SHA-256: ebb7571e95f8cb0f3adf7b1fe736b00f3273b05572d5e44788e680a594dcb8b6
font_01_sfnt_off00008aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AEF 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off000094b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94B1 19884 bytes
SHA-256: 597e2c034d8ef7839bb6e67b42fc8f8d944492483dde3dcbb81bd3943445a80c

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