Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a24a13b162ea929…

MALICIOUS

PDF

35.2 KB Created: 2021-07-07 19:19:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c918191ea9442aeda650b7e64b5cabc3 SHA-1: 49fd6c4dae83f5a1a8975f3388658301a4dc4b11 SHA-256: 8a24a13b162ea929ea4cc61fe77c11705125c8177bb3d8a40d2e065281301516
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically advertising a 'free generator / game hack'. This lure is designed to trick users into clicking the link, likely leading to a further malicious download or exploit. The ML classifier strongly supports the malicious nature of this PDF.

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/coin-monster-game-hack In PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/roblox-free-pants-and-shirt-president_GM431946152.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/free-minecraft-com_GM479516143.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/google-how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/roblox-games-with-free-boombox_GM431946152.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/roblox-sexually_GM431946152.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/roblox-robeats-hack_GM431946152.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/roblox-pet-simulator-coin-hack_GM431946152.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/hack-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/robux-free-may-2021_GM431946152.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/moonactive-free-spins-link_GM406889139.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-get-free-clothes-from-catalog-roblox_GM431946152.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-hack-a-roblox-account-2021-easy_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
font_00_sfnt_off000034b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34B3 22900 bytes
SHA-256: 9bf051f56cae4b48d0077f65b9ed6d4fca41101e2de26535258e11b0228ef766
font_01_sfnt_off00006820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6820 17836 bytes
SHA-256: ecea4e06c2319bfbde5a9eafaa104503e5acdd43c54713b47264e7f5b68a66df

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