Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d9949d74774cbb…

MALICIOUS

PDF

46.5 KB Created: 2021-06-09 09:53:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a96e8aa3b8d423dda6efecdd422e4a50 SHA-1: 69a1e41f92689df60ed7a8cf07411d153efd86c4 SHA-256: c5d9949d74774cbb8a57b93892dbcaea204a07b367adbf8a679ce6a01f9831c6
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to free Roblox gift cards, directing users to a suspicious URL. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest a phishing or redirection attack designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.tw/app/431946152/free-unused-roblox-gift-cards-game-hack PDF link annotation
    • https://c2o-library.net/catalog/repository/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-obby_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/robux-earning-websites_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-place-rewards_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-coins-and-spins-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/robux-premium_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/universal-minecraft-converter-free_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/60-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-hacked-accounts-list_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-toys-code-free-dog_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-e-free_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/mcpe-com_GM479516143.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_004_off000051f1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51F1 28140 bytes
SHA-256: 7d23e19071591d9b6658ab5f11f48fd2b79ad5aabef3669be480eac4f7ffcfce
font_01_sfnt_off00009189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9189 18900 bytes
SHA-256: f0b12da4fb7d81f2fdb4a6139b3049f45db374f5e5c2958ffe3483fb34b731f5

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