Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed4074037009e30…

MALICIOUS

PDF

29.0 KB Created: 2021-07-06 00:53:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6872b5d395deabe18904189e000adc92 SHA-1: cb642ab65fdc4153a1f5b43e6fe4a01c02b33d84 SHA-256: fed4074037009e3023127ae09fb4438e6bf28f263591f888275b886fa963d477
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains embedded links that redirect to known malicious infrastructure, masquerading as "free generators" and "game hacks" for popular games. The malformed stream length and ML classifier indicate a high likelihood of malicious intent, likely to deliver a second-stage payload or phish for credentials. No scripts were extracted, but the PDF's structure and embedded URLs strongly suggest exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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-games-that-actually-work-2021-game-hack In PDF document text
    • http://oca.undil.tl/repository/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-coins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-cheat-codes-for-jailbreak_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/hack-coin-master-android-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/offers-for-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3192 21940 bytes
SHA-256: 8da6dadb8653f4acf4a8d8c7339396771839cb8ac625c8ee6d0e6c9fdfb1eb9d

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