Malicious PDF — malware analysis report

Static analysis result for SHA-256 668ee2d8fee81c81…

MALICIOUS

PDF

43.8 KB Created: 2021-05-12 01:05:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3df21c8d94bbd876e5102ede17de191c SHA-1: c69b3ada37f99482010c269c42b71281576fc68e SHA-256: 668ee2d8fee81c817b3bc2eee3229f59fd38cfe85f34da5097a0fa26e33cc8c1
122 Risk Score

Malware Insights

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

The PDF document employs a lure related to 'free Robux' and game hacks, impersonating Facebook to trick users into clicking a malicious URL. The embedded URL, https://netcdn.xyz/app/431946152/free-robux-no-gift-card-game-hack, is the primary indicator of malicious intent. While no scripts were directly extracted, the PDF structure and heuristics suggest it is designed to exploit vulnerabilities or redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/free-robux-no-gift-card-game-hack.
  • 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.xyz/app/431946152/free-robux-no-gift-card-game-hack PDF link annotation
    • http://fkunismuh.org/perpustakaan//repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/earn-robux-today_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/roblox-hack-client_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/spin-coin_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coin-master-hack-app-for-ios_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-free-spins-coins_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
stream_003_off000048d8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48D8 27644 bytes
SHA-256: e1ef408cbc25cba871bd631a920b187a1dc0df15531ebe4d9152cec4d9c52a9a
font_01_sfnt_off000087ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87EC 18640 bytes
SHA-256: 5e2a3e67d4e6faa48e47b93c69738121aad1fd6f7e815cfd3538255806571323

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