Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bdb7b465f36b92…

MALICIOUS

PDF

35.2 KB Created: 2021-06-28 06:45:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ebcfd61ff8a295fb75729d9f9e95db28 SHA-1: 485486ef352999cf2fcc2b5de0f08aff2f3a4b27 SHA-256: c4bdb7b465f36b92b7beb59239ee259e9183ddbbfc6f1a139dcde179ef4c202e
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple lures related to game hacks and free in-game currency, specifically 'Robux'. It embeds several URLs, with http://netcdn.co/app/431946152/app-free-robux-game-hack being a primary indicator of a redirection to a malicious site. The presence of PDF-specific heuristics like 'PDF_GAME_HACK_REDIRECT_LURE' and 'ML_NYX_PDF_MALICIOUS' strongly suggests malicious intent. Although no scripts were explicitly extracted, the document structure and embedded links point towards a phishing or scam attempt, likely delivered as a spearphishing attachment.

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/app-free-robux-game-hack PDF link annotation
    • http://elibrary.smknesbu.sch.id/repository/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-roblox-for-robux-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/earn-robux-now_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-now_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/tener-hacks-en-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-hack-2021-october_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/game-guardian-hack-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/robux-login-free_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/huge-roblox-hacker-hacking-into-acc_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-anti-hack-saving_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_off00003208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3208 22844 bytes
SHA-256: 2e73deddd1f413723b8597869cc7ca0e962f696eed647dc4185714d24e71cd27
font_01_sfnt_off00006501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6501 18892 bytes
SHA-256: adcc151481d64a287c05a5ede435f34aa750aef5dde4e5dd27f082e4a028da81

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