Malicious PDF — malware analysis report

Static analysis result for SHA-256 63fa76b1ea588c98…

MALICIOUS

PDF

45.1 KB Created: 2021-06-08 12:31:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 45a0970e1fd5fc8bdedef2c186b689b1 SHA-1: 1c4289412d2ba2e32c2b128ea18af252886a1df4 SHA-256: 63fa76b1ea588c98219ecfa726c48e61b2e5bbfab9ae659b908f3166e6dd9886
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks and free items. The primary redirector URL is https://netcdn.tw/app/431946152/roblox-free-costumes-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirection workflow, likely intended to lead the user to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/roblox-free-costumes-game-hack In PDF document text
    • http://bw.ac.th/userfiles/files/minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-mojang-account-with-minecraft_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/pokemon-go-free-daily-spawn_GM1094591345.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/minecraft-free-education_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/hacks-minecraft_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-robux-games_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-heaven-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-executors-for-roblox_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/synapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/easy-roblox-today_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-do-you-get-free-roblox-money_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_004_off00005288.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5288 25372 bytes
SHA-256: 699e18eb7f54390012a0c6120bd7159ed5022b642d2da5bfb781ecf8673e2b3d
font_01_sfnt_off00008d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D34 18452 bytes
SHA-256: 792c44bbb893259f5d0bdf23518a7f19dff3d3222a6f768ce6a643234c0d1f29

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