Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a4f67add38e83e…

MALICIOUS

PDF

35.1 KB Created: 2021-06-30 10:52:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e37d1015bbbade0b2105c0e0c22305dc SHA-1: a073892e954dab754081af7f65253e3f5916cb51 SHA-256: d9a4f67add38e83e2632dfea75ca80dedfcd7f55a9b691eadefc814ff06d624c
82 Risk Score

Malware Insights

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

The PDF document contains a lure for 'free Robux' and links to external URLs, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/free-robux-off-of-roblox-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/can-i-change-back-to-old-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spin-bonus_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-18_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-generator-no-waiting_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-admin-hack-free-download_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/toolbox-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-coins-for-flip-master-online_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-hacked-pour-avoir-des-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-hack-apk-2021-ios_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-jailbreak-nuevo-menu-de-hacks-actualizado-rocket-fuel_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-cheat-on-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/what-cheats-can-you-do-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-20-free-spins-link-2021_GM406889139.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_off000032e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32E6 22488 bytes
SHA-256: 19ff586738705fd0cea1d77e91c7a958e61ca4e5ea207e7dcae3b9ca6466743a
font_01_sfnt_off00006524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6524 18788 bytes
SHA-256: 6eb41c4db453bfbfef0aa833c2ed911a1a4d0c7f615581ce67c46b32e8250e8b

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