Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f81c1f016fdb203…

MALICIOUS

PDF

34.1 KB Created: 2021-07-03 12:01:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b747dc0e2e9464853b8246c30eda1346 SHA-1: 1b70f5736d8ebbcf184fa4cb9187bd0972d4cdf2 SHA-256: 7f81c1f016fdb203803eb3c45dc7808111bb355f8b9b7098f2be1f281ba522db
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a prominent call-to-action lure related to obtaining free in-game items for popular games. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or malware distribution. The primary URL, http://netcdn.tw/app/479516143/free-24-7-minecraft-server-game-hack, is likely the intended download destination for a malicious payload.

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/479516143/free-24-7-minecraft-server-game-hack In PDF document text
    • https://registrasi-transvision.com/ckfinder/userfiles/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://registrasi-transvision.com/ckfinder/userfiles/files/free-goahead-london-roblox-buses_GM431946152.pdfIn PDF document text
    • https://registrasi-transvision.com/ckfinder/userfiles/files/free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • https://registrasi-transvision.com/ckfinder/userfiles/files/roblox-free-pants_GM431946152.pdfIn PDF document text
    • https://registrasi-transvision.com/ckfinder/userfiles/files/free-robux-real_GM431946152.pdfIn PDF document text
    • https://registrasi-transvision.com/ckfinder/userfiles/files/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://registrasi-transvision.com/ckfinder/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://registrasi-transvision.com/ckfinder/userfiles/files/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://registrasi-transvision.com/ckfinder/userfiles/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://registrasi-transvision.com/ckfinder/userfiles/files/wurst-hacks_GM479516143.pdfIn PDF document text
    • https://registrasi-transvision.com/ckfinder/userfiles/files/free-spin-coin-master-apk_GM406889139.pdfIn PDF document text
    • https://registrasi-transvision.com/ckfinder/userfiles/files/scripts-for-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://registrasi-transvision.com/ckfinder/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://registrasi-transvision.com/ckfinder/userfiles/files/how-do-you-get-bloxburg-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://registrasi-transvision.com/ckfinder/userfiles/files/roblox-dominus-frigidus-free_GM431946152.pdfIn PDF document text
    • https://registrasi-transvision.com/ckfinder/userfiles/files/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • https://registrasi-transvision.com/ckfinder/userfiles/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://registrasi-transvision.com/ckfinder/userfiles/files/free-spins-coin-master-without-completing-offers_GM406889139.pdfIn PDF document text
    • https://registrasi-transvision.com/ckfinder/userfiles/files/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • https://registrasi-transvision.com/ckfinder/userfiles/files/coin-master-hack-tool-generator_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_off00003377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3377 21764 bytes
SHA-256: 369470da6bb8c444a542180bb4f059fd7dab250a3b7cab6b3e1061f223558f9d
font_01_sfnt_off0000629e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x629E 18212 bytes
SHA-256: dc240a4c7f6d6ef542df3e92dc5e6be0114423f2adfadbc72c3334056908e6df

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