Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13b7aabb1a006a9…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 16:10:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7334cd22db68901ca8db800852625df3 SHA-1: d7cfda8aa6a9ad27a31fadf47473732576b486d9 SHA-256: b13b7aabb1a006a98ecd68c1286e8f81197eb4cdfb960992b59faedd1917e697
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector, that lead to sites offering game hacks and free in-game currency. The primary link, http://netcdn.tw/app/406889139/best-free-spins-for-coin-master-game-hack, is associated with a lure for game generators. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or scam attempt to redirect users to potentially harmful content.

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/best-free-spins-for-coin-master-game-hack In PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/2-player-cheat-pizza-tycoon-in-roblox_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-4l-tiktok_GM835599320.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/roblox-cube-defence-cheat_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/how-to-get-any-roblox-game-for-free_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/codes-to-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/hacker-finder-roblox-id_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/how-to-get-free-robux-on-ipad-no-verification_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/coin-master-hack-apk-ios-download_GM406889139.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/how-to-get-verified-on-tiktok-for-free-2021_GM835599320.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/free-roblox-invitation-template_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/how-to-get-free-robux-2021-envix_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/access-here-https-roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/italwhts-the-best-free-horror-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/roblox-promo-code-hack-pastebin-2021_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/how-to-get-robux-for-free-real_GM431946152.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • http://cartoriogoianira.com.br/ckfinder/userfiles/files/coin-master-free-coins-today_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_off000031b7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31B7 22500 bytes
SHA-256: 361b453c4c78af1ba5b7b59fb72579d9ed8704895682854d483dea80344c47be
font_01_sfnt_off00006405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6405 18388 bytes
SHA-256: 924d82b7b18e470f0317a48498cf72fd5de55868874b4ed9b89114724747ab16

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