Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce481bd85ad7a5c…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 12:25:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b8730474871a49c3ffc74f33c26b536e SHA-1: 5fe17ef9fed5fd5c526fb57515669f453afc79df SHA-256: 2ce481bd85ad7a5c4aed262d92a8eea372639445e54b4a3f65cda30577855b9f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document uses a lure of 'Free Robux Redeem Codes 2021' and 'game hack' to entice users to click on external links. The primary link, http://netcdn.tw/app/431946152/free-robux-redeem-codes-2021-game-hack, is identified as a high-risk redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or scam attempt, likely leading to further malicious downloads or credential harvesting.

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.tw/app/431946152/free-robux-redeem-codes-2021-game-hack PDF link annotation
    • https://loba.com.vn/public/upload/files/infinite-jump-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-free-cards-link-2021-today_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/robux-free-eazy_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/top-free-commands-in-roblox-without-admin_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-live_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-tiktok-followers-no-survey-or-verification_GM835599320.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/toolbox-mod_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-robux-hack-program_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-can-you-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-admin-hack-no-virus_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-codes-to-get-free-items_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-kid-games-online-roblox_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/hacks-for-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-bear-face-mask-free_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/ways-to-get-free-robux-2021_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_off00002f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F28 22632 bytes
SHA-256: c9763bd1f73a42d90f9be5ed18c3c15bae1291f466182beab8197f48f4dcfbe3
font_01_sfnt_off000061ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61AE 19552 bytes
SHA-256: 9e1dac473263c0de9d7d37a0c1ac97fc6faf5ff8611277a673aaa799431b51c3

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