Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3afb1b15c7723d…

MALICIOUS

PDF

33.9 KB Created: 2021-07-05 08:41:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3c73bbfe5940e96aaa1a0549c4c8ea3e SHA-1: de31e5bd08a369ab9b7eb053e4946775ebb0cbc1 SHA-256: 8e3afb1b15c7723d3eca4647a7d2ee1c56780ee28165efb42b92ce7ca1a25ce5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirector infrastructure, specifically advertising free Robux or game hacks. The embedded URLs, such as http://netcdn.tw/app/431946152/free-100-robux-game-hack, are designed to lure unsuspecting users into clicking, likely leading to further malicious content or downloads. 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/431946152/free-100-robux-game-hack In PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/how-to-hack-into-your-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/free-robux-link_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/get4mobilebiz-free-robux_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/lua-c-free-camera-roblox_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/roblox-sir-robux-hack_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/free-robux-website_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/how-to-hack-roblox-accounts-on-ipad_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/where-to-find-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/roblox-hack-scropts_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/tiradas-coin-master_GM406889139.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox-on-an-ipad_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/free-400-spins-coins-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
font_00_sfnt_off00002f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F7A 21768 bytes
SHA-256: 0d4b053a69832bd92f75caae01eb256e1b43d4482323e22651a4b96622a42563
font_01_sfnt_off00005f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8A 18996 bytes
SHA-256: 50307759301c9532eb20b67e87d9cc20f2fa9f514687c8f0dcdabe953bf72270

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