Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9a08a95ab2b535…

MALICIOUS

PDF

36.1 KB Created: 2021-06-28 06:45:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2ed7b509542fe70c0b9ccae3b3aa7468 SHA-1: 109a254361a686f5c2666a2b4c33671cb3dabfd1 SHA-256: 0f9a08a95ab2b535ca3e941785f796d9a457d1fe719fdd4a7d06f8250a9bdb7f
180 Risk Score

Malware Insights

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

This PDF document contains a malformed exploit stream and links to known malicious redirector infrastructure, specifically advertising 'free Robux' and game hacks. The primary lure is the URL http://netcdn.co/app/431946152/how-to-get-free-robux-quick-and-easy-2021-game-hack, which is designed to entice users to click through to potentially malicious sites. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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/how-to-get-free-robux-quick-and-easy-2021-game-hack In PDF document text
    • http://razredna-nastava.net/files/minecraft-free-online_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-get-free-pet-dog-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/unlimited-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-piano-hack-no-download_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/latest-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-free-spins-link-without-human-verification_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-roblox-wallpapers_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-a-free-dominus-in-roblox_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/nombre-hacker-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/fast-robux-online_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-lovenet_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-spin-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-hack-coin-master-pc_GM406889139.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_off0000314f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x314F 22752 bytes
SHA-256: 06fd0b7fe2d2285196077440d229263bc77b3b81e9c960a4a43cc1dd8cf63445
font_01_sfnt_off00006457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6457 20188 bytes
SHA-256: df47ab53a34c02962b10fc9b1963c303163bf3bbd152bfe22393d387eb8dee8d

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