Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8efea5d739fb34…

MALICIOUS

PDF

38.0 KB Created: 2021-07-05 14:15:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 53a466e836cbddb4e52407b88707ccfb SHA-1: 9d9bc6b94a129cd98a0fda7eb1ce7bd373a522f8 SHA-256: 7b8efea5d739fb34cb8e3fc5abb73c5c3b99d7fab79c1154e19898625e7e0c9e
122 Risk Score

Malware Insights

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

The PDF document contains multiple links and text lures related to 'free Robux' and game hacks, aiming to trick users into clicking through to potentially malicious sites. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and the presence of numerous related URLs strongly indicate a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and embedded links suggest a client-side exploitation or redirection vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://netcdn.tw/app/431946152/free-robux-no-human-verification-or-survey-or-download-2021-game-hack PDF link annotation
    • http://global-brand.net/userfiles/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-robux-android_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/roblox-how-to-cheat-the-disconnect-thing_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/tiktok-download-free-jio_GM835599320.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/roblox-sand-simulator-hack-android_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-hack-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/pubg-uc-carding_GM1330123889.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-create-group-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-hack-on-an-ipad-in-roblox_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/hack-roblox-with-cmd_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/bad-minecraft-free_GM479516143.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
font_00_sfnt_off000037a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37A9 23124 bytes
SHA-256: d48d63a0c29d37f71a6cec3a43f16345beb44eba48047f71c13787428fab6d9b
font_01_sfnt_off00006b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B1F 20608 bytes
SHA-256: 84e083980845d6db402b7178d67bc98d29f4cdbc71d93f4e93f474fc98f39a9a

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