Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1a91d97690598e…

MALICIOUS

PDF

47.2 KB Created: 2021-06-03 14:04:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f585f79e6241b34a7056c20c7af75642 SHA-1: 6a3ab41961e25b1338b0a745d600d37f024fe3d5 SHA-256: bd1a91d97690598eaf45000b51f1b962b27742c6285e793853e4e064da7625df
160 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to malicious redirector infrastructure, specifically promoting a 'Coin Master hack'. The document body, though heavily obfuscated, contains references to the same URL. This indicates a social engineering lure designed to trick users into visiting a malicious site, likely to download further malware or engage in other malicious activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.online/app/406889139/coin-master-latest-version-hack-game-hack In PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-pet-food-free_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/pubg-uc-trick_GM1330123889.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-bobux_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/xray-hack_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-heaven-links-free-spins_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/2021-free-spins-on-coin-master_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
stream_004_off000050af.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50AF 34576 bytes
SHA-256: 5591f52bd5339ecd98f38cf747c6c9550de411b74ee786ccb03701e4bdcfe584
font_01_sfnt_off00009734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9734 17848 bytes
SHA-256: e6a541bb9d0fa392ff7c4dd8c6fe04cfd1564a102b60f3b8f3e9956a20f70d19

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