Malicious PDF — malware analysis report

Static analysis result for SHA-256 768ebc9ac2508ac5…

MALICIOUS

PDF

42.9 KB Created: 2021-05-19 13:34:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8eb71a8ac4f80e4fc9be5ceaf3830079 SHA-1: ab0a4cb279b33356b855c4429621b5f5f5a62656 SHA-256: 768ebc9ac2508ac5b3d3ac8f8d7ce2971d6d77b85835125800bf24fbecafbb4f
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 0.9971

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.xyz/app/406889139/coin-master-heaven-daily-free-spins-and-coins-links-game-hack PDF link annotation
    • http://www.riverkennet.org/uploads/files/files/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/tiktok-free-fire_GM835599320.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/robux-app_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/infinite-robux_GM431946152.pdfIn 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_003_off00004850.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4850 25656 bytes
SHA-256: 74a3616f6fde8d5edb7c53597e10533c5977b1f9258c3756b67b1cf4fa71c0e4
font_01_sfnt_off000083c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83C9 18764 bytes
SHA-256: dfa0e0ac2467a401dcf1fafcf35c576492c4ef590534d1fa5d150cc8f866fc69

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