Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76abdcdb89212c3…

MALICIOUS

PDF

34.1 KB Created: 2021-07-06 14:18:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4edfe3ae435d5bcfd6c93b0f2cc00630 SHA-1: 11b32801eeb1cb67e9131901c7790b2f0a5adb72 SHA-256: c76abdcdb89212c3ddabd179c5a758fe488f7a4776bcc7143c4d641ab28694eb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a known malicious redirector infrastructure, specifically promoting 'free Robux' or game hacks. The document body and heuristics indicate a lure designed to trick users into visiting these malicious sites, likely for further exploitation or malware delivery. No scripts were extracted from this sample.

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.tw/app/431946152/free-robux-for-free-game-hack In PDF document text
    • https://library.univthamrinaka.com/repository/free-roblox-accounts-2021-hack_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/free-robux-no-survey-or-app-download_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/pick-a-side-hack-roblox_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/free-gameplay-to-use-shooting-star-roblox_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/free-robux-xlothroblox_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/free-uber-roblox-id_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/robux-hack-no-download-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/roblox-giant-hand-hack_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/roblox-tycoon-simulator-script-hack_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/coin-master-hack-fast-org_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/girl-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/free-robux-script_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_off00003086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3086 22096 bytes
SHA-256: d3550158f965884bf7102d683f90d9d9f1772af0bdd280addb545e18fd9c1116
font_01_sfnt_off00006140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6140 18716 bytes
SHA-256: ae86725dd70d168e8b5a24377d7effb3bd88f81667aa3e091abc0f5759eb354b

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