Malicious PDF — malware analysis report

Static analysis result for SHA-256 721cd9b4aba12ecc…

MALICIOUS

PDF

34.8 KB Created: 2021-07-09 14:29:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 05a111e1102928cf69b897b1cfc0a3ab SHA-1: 369687c1bae1fb45a17bdf17db07ca07dee0f942 SHA-256: 721cd9b4aba12ecc795bb32440823be19c84da82406a9075696f62b5309a5149
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure for free game currency or hacks, directing users to a known malicious redirector. The embedded URL http://netcdn.tw/app/431946152/how-do-you-get-free-robux-game-hack is associated with malicious redirector infrastructure. While no scripts were extracted, the PDF structure and embedded links strongly suggest a phishing or scam attempt designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/how-do-you-get-free-robux-game-hack In PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/https-pastebin-com-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/how-do-you-get-the-ability-to-hack-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/hack-roblox-2021-17-de-junio_GM431946152.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-err-face-roblox_GM431946152.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/horizon-in-roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/tiktok-free-usernames_GM835599320.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/roblox-2021-november-hacked_GM431946152.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/roblox-studio-download-free-android_GM431946152.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-gamepasse-roblox_GM431946152.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/cheat-apocalypse-rising-roblox-25-fvrier-2021_GM431946152.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/nuebo-hack-de-robux-atualizasion_GM431946152.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/roblox-call-of-robloxia-5-hack_GM431946152.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/orewards-com-free-robux_GM431946152.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
font_00_sfnt_off00003145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3145 22220 bytes
SHA-256: a46714b0189b0062f3c7feef41f072f155148d70679e30e02ff8c3e6f3a0e7d4
font_01_sfnt_off00006234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6234 19316 bytes
SHA-256: 99209f55b8a3eadb57fc79f11dd938dc70b993b67b3cdd4e22b37a6312af6b20

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