Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d1ec6e45b90b8b…

MALICIOUS

PDF

45.4 KB Created: 2021-06-03 05:13:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c1697cffba6b1df764a0402c721986b6 SHA-1: df64a599c394bfc01bc8d89aa9b7f11b84447cfe SHA-256: 51d1ec6e45b90b8bd5e046858db952083ad1000699320331b97762c550fc828d
222 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure and instructions to paste commands, designed to trick users into executing malicious code. It links to external URLs that offer game hacks, a common pretext for distributing malware. No scripts were extracted, but the document's structure and embedded links strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 7

  • Fake CAPTCHA with command-running instructions critical SE_FAKE_CAPTCHA_CLICKFIX
    Document combines fake CAPTCHA or human-verification language with instructions to paste or run a command — a high-confidence ClickFix pattern
  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.online/app/479516143/how-to-get-minecraft-windows-10-for-free-2021-game-hack PDF link annotation
    • https://library.uigm.ac.id/repository/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/best-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/minecraft-xbox-free_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/hack-coin-master-dzooka_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-hack-cheat-engine_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-tiktok-likes-no-human-verification-or-download_GM835599320.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-ftw_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-roblox-money_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/tiktok-free-like-and-views_GM835599320.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_off0000545b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x545B 25640 bytes
SHA-256: f7206817d8b9c6a90cc5b37f4bb5a302f633e374d6c1d70f5faac0440c3f0b88
font_01_sfnt_off00008dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC7 18648 bytes
SHA-256: 354bb2c2c4fae14b5c7df711c8f5a389dfe67cd832e4a835714c7b2f7ea7fa4d

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