Malicious PDF — malware analysis report

Static analysis result for SHA-256 91def9c24d1bffce…

MALICIOUS

PDF

36.1 KB Created: 2021-06-30 07:10:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3da6cbba41a0a4dfc84b164c37a6ccf3 SHA-1: 63f61bb94138ca85218d0e518714774c2762719e SHA-256: 91def9c24d1bffce9873b6dab77d054a9f9c92d7e4ebbbfd57fe7c7385e342a1
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 what appears to be a free Robux generator or game hack. The primary link directs to a known malicious redirector infrastructure, which likely serves as a gateway to further malicious content or downloads. The document's content and embedded links strongly suggest a phishing or scam attempt, leveraging popular game-related lures to entice users.

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-no-human-verification-no-inspect-2021-game-hack In PDF document text
    • https://i-tech.ac.id/perpus/repository/hack-robux-2021-android_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/free-roblox-shiny-charm-for-pokemon-brick-bronze_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/how-to-hack-robux-with-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/free-clothes-for-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/cheat-codes-for-pokemon-galaxy-in-roblox_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/free-roblox-accounts-with-passwords-and-robux_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/roblox-noclip-hack-no-cheat-engine_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/hacker-names-list-roblox_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/free-toys-codes-roblox-2021_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/how-to-get-free-robux-easy-zephplayz_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/roblox-vip-gamepass-free_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/back-to-hack-roblox-id_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/roblox-natural-disaster-survival-hack_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/easy-ways-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/roblox-super-power-training-simulator-hack-download_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_off000032b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32B4 22868 bytes
SHA-256: 917295532d8c8258552e0e99a5af97a88d32b946cb20a9bdac1a7b8e3dc3c210
font_01_sfnt_off000065b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B0 19912 bytes
SHA-256: 25e2c08b6cded67e845f6035508b83a23bf347f4870911187415767c3c85c63f

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