Malicious PDF — malware analysis report

Static analysis result for SHA-256 077e069ccc9f0a9f…

MALICIOUS

PDF

44.3 KB Created: 2021-06-03 19:26:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3ecfc24e89560e2c1b825159c950bf69 SHA-1: 750469cba3143bd085c0b5fd42cbecbdb70b97dc SHA-256: 077e069ccc9f0a9f00faba986a6dfe75bdeb3c3406462dda718104df5c5e8d7d
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/roblox-counter-blox-hack-aimbot-wallhack-game-hack PDF link annotation
    • https://cuc.ac.cr/userfiles/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-hack-using-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/robux-free-robux_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/coin-master-32-mod-hack-unlimited_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-get-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/roblox-robux-generator-tool_GM431946152.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/minecraft-bedrock-edition-pc-free_GM479516143.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/como-hackear-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • https://cuc.ac.cr/userfiles/files/how-to-get-free-robux-inspect_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
stream_004_off0000502f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x502F 24276 bytes
SHA-256: bda13544d891c7fa5d10a575bb77d9f2a18ea6999f1b8e463b86dfed5d3ebe39
font_01_sfnt_off000087da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87DA 19172 bytes
SHA-256: fd5ccf82f4ad04f73b30d1721500c04e3199b1eb931b43f8eeca01529f7b651c

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