Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c909f3212dd7b7…

MALICIOUS

PDF

34.6 KB Created: 2021-06-27 20:16:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 52fa3940ef741e2d0c31b745db680fab SHA-1: a07bd8a518fbe47d51f2eb674c35bae44500bfef SHA-256: b6c909f3212dd7b7aef1c8eed7200bc1f20e3da891448a9a41670eb4e8d55cdb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure users into clicking on offers for free in-game currency or hacks. The primary link, http://netcdn.co/app/431946152/free-robux-pastedin-game-hack, is identified as a malicious redirector. The document's content and heuristics suggest a phishing or scam attempt, likely leading to further malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.co/app/431946152/free-robux-pastedin-game-hack In PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-roblox-money_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-bloxburg-free-release-date_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/tiny-tanks-cheats-roblox-2021_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-games-like-roblox_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-instagram-free-spins_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-sex-hack-download_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-hacks-xyz_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-bux-free_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/pig-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/robux-no-human-verification-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_off00002e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E4B 22952 bytes
SHA-256: d261b5b6be043c7e3f8c086faa0e29f0221ed74597e38bbd1faaff4cd6a10f8a
font_01_sfnt_off0000619d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x619D 19268 bytes
SHA-256: f844db69f262c292e33c83470680f86d44ba8f7f6ffe5d7470a4a6866f8ea9df

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