Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfeb0e126a3efd4b…

MALICIOUS

PDF

34.6 KB Created: 2021-07-03 16:47:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 87040039f89c063fae7425ab77419eb7 SHA-1: 999a47971280f0ecf6d95600593666e1d0308946 SHA-256: cfeb0e126a3efd4b8d8dacf5371f3f36149d2fb1b81cf46eeedd9780354ce758
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a prominent external URI pointing to sites offering game cheats and free currency. The ML classifier strongly flagged this PDF as malicious, and the presence of these links suggests a phishing or malware distribution attempt. No scripts were extracted, but the document's content and external links indicate a lure for users seeking in-game advantages.

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-spins-today-daily-links-game-hack In PDF document text
    • https://ivalue.tw/files/ckfinder/files/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/robux-hack-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/coin-master-card-hack-app_GM406889139.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/free-domino-code-roblox_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/roblox-give-robux-free_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/robux-hack-no-download-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/how-to-hack-roblox-with-cheat-engine-64-robux_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/how-to-hack-in-roblox-on_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/free-50-robux-card-code_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/www-free-robux_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/hack-de-10000-robux-en-2021_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/free-roblox-tickets-hack_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/free-robux-no-human-verafy-no-servay-free_GM431946152.pdfIn PDF document text
    • https://ivalue.tw/files/ckfinder/files/get-free-robux-com_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
stream_002_off00003039.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3039 22572 bytes
SHA-256: 80decca2666a1b9d1df226abb718f6015d34e088c5aeb131cf52ee4822dfd27d
font_01_sfnt_off000062a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62A8 18940 bytes
SHA-256: 74e1d82992a432109423c701e24adf08bd24e863db22c1b49c4282e3a69c5270

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