Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ec4ae6656869b9…

MALICIOUS

PDF

33.8 KB Created: 2021-06-19 08:31:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6bca8944c24fe667c19c343d28747ac9 SHA-1: 821d8e2aa77b7dd54c7b373357b86728b0b2baa0 SHA-256: 71ec4ae6656869b9885216dd6969fab4609ab81e133be5326fdb616c6d27dd2d
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains lures related to obtaining free game currency (Robux) and prompts the user to install a browser extension or update. This social engineering tactic is a common method for delivering malicious payloads. The embedded URLs likely lead to further stages of the attack, potentially involving malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.co/app/431946152/como-coneguir-robux-gratis-roblox-pc-sin-hacks-game-hack PDF link annotation
    • http://perpus.i2s-learning.com/repository/free-roblox-shirt-templates_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-superhero-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-roblox-clothes-and-hair-girl_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/tiktok-free-download-for-windows-10_GM835599320.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/minecraft-net-free_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-robux-without-human-verification-on-ipad_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-working_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-free-mighty-lion-card_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-games-to-play-for-free_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
font_00_sfnt_off00002c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C86 22336 bytes
SHA-256: 3fdd81701924ae533a0acdad7bdd6453bf24704b9317720afb380c3bd23b3b82
font_01_sfnt_off00005e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E4B 19432 bytes
SHA-256: 02d89ce2004c31e6de4306cc9ae55f8b829b3d5e1c480bc6199017e10500eb90

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