Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd71d3ce6c31df2…

MALICIOUS

PDF

31.2 KB Created: 2021-07-07 08:55:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5554b246a07f2b3b78c3d999187fe1de SHA-1: 63823a33843928b9582dcca34acf715a247ef928 SHA-256: 5bd71d3ce6c31df2861309bb7e6a1c1c407ff266ef8cf01f671c2afc636ca610
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures for free game items and accounts, directing users to malicious redirector URLs. The embedded URLs are designed to trick users into visiting potentially harmful sites, likely for credential harvesting or further malware delivery. No scripts were extracted, but the document's structure and embedded links strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 3

  • 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.
  • 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-roblox-accounts-with-robux-that-work-not-banned-game-hack In PDF document text
    • http://fobh.net/userfiles/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-jackpot-madness-hack_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-bird-in-roblox_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/robux-earning-websites_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/furky-safe-free-roblox-exploits_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-hack-into-the-big-brother-house-roblox_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-roblox-accounts-with-obc-2021_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/roblox-muscles-free_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/mangocheats-com-hack-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000322a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x322A 21944 bytes
SHA-256: 1af2e844c76e4a77137d318526e86c1b30f2ca9a85795f87c595f0f8d7d8a825

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