Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a256de9d45c3fe…

MALICIOUS

PDF

43.0 KB Created: 2021-05-18 04:37:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 953b07098255dcf2eb9f6d0777a6034d SHA-1: 939b86446ee937552bf7b45bcf9d0cd992351475 SHA-256: 52a256de9d45c3fe74039ac82d2259f2f434e2074ccd0301983d7f856b66cd20
160 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to known malicious infrastructure, disguised as a 'free generator / game hack'. The document body and heuristics strongly indicate a lure to a scam or potentially a malware download site. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a client-side exploit or redirection chain is likely initiated upon interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-free-spins-link-october-2021-game-hack In PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/worst-client_GM479516143.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/coin-master_GM406889139.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/coin-master-free-spins-activegamer_GM406889139.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/all-links-for-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/free-spin-and-coin-blogspot_GM406889139.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/coin-master-free-spins-fb-champion_GM406889139.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/minecraft-mod-updater_GM479516143.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/roblox-cheat_GM431946152.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/coin-master-game-free-download-for-pc_GM406889139.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/can-i-play-roblox-for-free_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
stream_003_off00004c25.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C25 25048 bytes
SHA-256: 1a53f1c4b647a9412f43fc7784c3fd2d0e857db69d8bb756001d923f83f324e2
font_01_sfnt_off00008475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8475 18616 bytes
SHA-256: 0f2e811bee16c6d18f413127386bb40392955d693e32d339659f7ff285c24676

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