Malicious PDF — malware analysis report

Static analysis result for SHA-256 c247864cef632b4a…

MALICIOUS

PDF

35.1 KB Created: 2021-07-03 18:32:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 84b4ffd40d52bc1b32fe90d7a72edfba SHA-1: 5b56b52dec5bd3db77c9dd1beaaf31faf1b311f8 SHA-256: c247864cef632b4af0ef70f2465cc7cdbab960afde358ad1b00ebcd8a5948989
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, including one pointing to a known malicious redirector infrastructure at http://netcdn.tw/app/406889139/free-spins-and-coins-blogspot-coin-master-game-hack. This link is presented as a lure for 'free generator / game hack' content, suggesting a social engineering tactic to trick users into downloading or visiting malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-spins-and-coins-blogspot-coin-master-game-hack In PDF document text
    • https://www.knjigebuducnosti.com/files/robux-cheat_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/hack-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-no-downloading-and-no-email_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/hacking-roblox-zombie_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-free-cards-and-spin-link_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coins-master-hacks_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-tiktok-coins_GM835599320.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-you-get-robux_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-get-free-stuff-on-roblox-with-inspect-element_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/sandbox-roblox-cheats_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/roblox-adopt-me-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-hack-tool-without-human-verification_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_off000031e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31E0 22948 bytes
SHA-256: f47fd1ca143e403182cf13035151fc3aa506b29da7cef06a6090826d189ff431
font_01_sfnt_off000065a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65A8 18636 bytes
SHA-256: 81c706591927eb79e6943da1b13ffaba4e197950c80117a06d94c90a496f3d49

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