Malicious PDF — malware analysis report

Static analysis result for SHA-256 92987b431378b3bc…

MALICIOUS

PDF

46.9 KB Created: 2021-06-03 14:02:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9492b759d4709434e33621a6d0249e26 SHA-1: 4cff1e71262299625b6f45ee7895daec3a3f5569 SHA-256: 92987b431378b3bc8f5ef6325e0a3a8a301245683e21b2d62c4e8ef8916dcef2
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a lure for game hacks and redirects to a malicious URL. The document body, though heavily obfuscated, contains text related to 'Free Robux Codes 2021 Real' and the authoring application is wkhtmltopdf, suggesting it was generated from web content. The primary malicious URL identified is https://netcdn.online/app/431946152/free-robux-codes-2021-real-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 https://netcdn.online/app/431946152/free-robux-codes-2021-real-game-hack PDF link annotation
    • http://elibrary.fl.unud.ac.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-hack-2021-without-human-verification_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-hack-software_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/freerobux-co_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/get-more-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-unlimited-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-free-spins-2021-app_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/roblox-hack-inspect-element-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/hack-coin-master-download-ios_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000502b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x502B 24612 bytes
SHA-256: fae4903f741c4ee61a1f480582e17ba607ca8d591306a1eb0865c3d5f50aa2c5
font_01_sfnt_off000088ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88AC 2820 bytes
SHA-256: 34dd21cbcbbf8680f9624d5ddfa25e49232e6768200f74ddacb5347fd7a5f6dc
font_02_sfnt_off0000924d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x924D 18892 bytes
SHA-256: 79fc292783aafa0d2798f175881928b0c75cb864ff282a378c41953696f75480

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