Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a81d5bd02b9bfb…

MALICIOUS

PDF

34.4 KB Created: 2021-06-19 13:37:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4ac336eef75030cf42a5e9095591996d SHA-1: 2809fed5f56d743b028cda91a4dd9016b274fa21 SHA-256: 87a81d5bd02b9bfbe6734082e237b248c62fca7d44ae6f995bbb06975b46d3f6
168 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and links to a known malicious redirector infrastructure, specifically advertising 'free generator / game hack' lures for popular games like Roblox and Minecraft. The document body reinforces this by displaying similar game-related download links. This indicates the PDF is designed to exploit user interest in free in-game items to redirect them to potentially malicious sites, likely for further exploitation or credential harvesting.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/hack-roblox-free-admin-game-hack In PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/coin-master-ios-hack-download_GM406889139.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/how-to-get-minecraft-bedrock-for-free-with-java_GM479516143.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/free-rewards-coin-master_GM406889139.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/client-minecraft_GM479516143.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/coin-master-ids-for-free-spins_GM406889139.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/minecraft-for-macbook-free_GM479516143.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/username-free-robux-site_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/coin-master-golden-card-hack_GM406889139.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/earn-robux-com_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/coin-master-free-spins-link-blogspot-2021_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_off00003079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3079 21844 bytes
SHA-256: 4573bab2a8d1e2aaa4a210110ac6b67746d7ec04b7e70be93fbf21d2bf954472
font_01_sfnt_off0000608e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x608E 19376 bytes
SHA-256: 794188669296f4756961e65555b6a33492904022fbfeb51ec7e4c17a8bb7c0ca

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