Malicious PDF — malware analysis report

Static analysis result for SHA-256 de790b868e32b69f…

MALICIOUS

PDF

34.3 KB Created: 2021-07-09 10:54:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c066694b10d876b031bef198182e3644 SHA-1: d79ce39670c56d1673e6c40c16140813db257e7c SHA-256: de790b868e32b69f7a5e0b45ffc41efe5b47697faf129787140e0670ad33494e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to malicious infrastructure, specifically targeting users with lures for game hacks and free items. The primary link, http://netcdn.tw/app/406889139/coin-master-free-shield-link-game-hack, is identified as a malicious redirector. The document's content and embedded URLs strongly suggest a phishing or scam attempt designed to lead users to potentially harmful sites.

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-master-free-shield-link-game-hack In PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/how-to-get-free-xp-in-pokemon-go_GM1094591345.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/roblox-free-items-in-catalog-2021_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/robux-cheat-codes-2021_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/spiderman-free-roblox-stuff_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-robux-codes-2021-june_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/oprewards-com-earn_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-spins-coin-master-android_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-roblox-credit-codes_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/fre-robux-now_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/hack-script-roblox-games_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/how-to-get-free-robux-easy-november-2021_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/roblox-boku-no-hero-academia-cheat-engine_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/hack-robux-online_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/how-to-get-free-chest-in-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_002_off00002f9e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F9E 22824 bytes
SHA-256: 21854a0add0d92af48c74bc1521c009a5a83d5409361c626fed6f6f81956cc08
font_01_sfnt_off000062a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62A9 18580 bytes
SHA-256: 28ee47efd6c2d2ec5d8d6e69d99c6b14bf9fd67f9a78f80b4c32aabff95defac

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