Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b451c5d471b419…

MALICIOUS

PDF

44.8 KB Created: 2021-05-14 13:31:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 277717d251e43b3121df7f394bcfa3d7 SHA-1: 7ef4fb686f609e9c365b01f01340376d9c2ae399 SHA-256: a3b451c5d471b419347b4cd164067dae46a7818678c8be2353f9bfb8699f44fe
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to websites offering 'game hacks' and 'free generators', a common lure for malicious downloads. The primary redirector URL is https://netcdn.xyz/app/406889139/coin-master-hack-2021-link-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attack aimed at tricking users into downloading further malware.

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 https://netcdn.xyz/app/406889139/coin-master-hack-2021-link-game-hack In PDF document text
    • https://wald-match.com.tw/upload/files/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/hack-coin-master-game-download_GM406889139.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/coin-master-hack-ios_GM406889139.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/is-there-any-tricks-or-working-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/how-to-get-minecraft-for-free-on-xbox-360_GM479516143.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/free-spin-and-coin-blogspot-com_GM406889139.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/free-coin-master-links_GM406889139.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/coin-master-hack-2021-android-apk_GM406889139.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/coin-master-hacks-no-human-verification_GM406889139.pdfIn PDF document text
    • https://wald-match.com.tw/upload/files/free-spins-coin-master-haktuts_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_003_off00004a8c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A8C 30244 bytes
SHA-256: a11f3ea4a1bb908bbd7f7e3d2692841a83e371c73cdbc796eb4e474cbe337f91
font_01_sfnt_off00008d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D63 18116 bytes
SHA-256: 17974cef81917e5ef69542194afa433aff210173cc902887fbc2b56a9328dd03

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