Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a96175e32ebfe2…

MALICIOUS

PDF

35.4 KB Created: 2021-07-09 06:25:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c5e4efdf3f62bf0eefa1fd2bed2fae21 SHA-1: b74fe604f7e277668e99521fb61ede109497558c SHA-256: 57a96175e32ebfe2ad97571f8d5890ef1cf20d237c716b43c930eb14f45112db
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The primary redirector URL is http://netcdn.tw/app/835599320/free-tiktok-accounts-and-passwords-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a social engineering attack designed to lead users to potentially harmful content or further malware downloads.

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/835599320/free-tiktok-accounts-and-passwords-game-hack In PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/hack-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/hack-all-games-in-roblox_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/how-to-cheat-on-roblox-obbys_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/free-robux-generator-fake_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/free-robux-script_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/roblox-cheat-engine-hack-2021_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/how-to-spot-a-hacker-on-roblox_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/coin-master-free-spins-generator-no-verification_GM406889139.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/flying-hacks-for-roblox-build-a-boat-for-treasure_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/how-to-record-on-roblox-on-pc-for-free_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/coin-master-card-hack-2021_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_off00003639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3639 21968 bytes
SHA-256: 2ed36a06b1ab1eb0e4d0186b85fb367fff9dfe5b7dc973330b8260e08451356f
font_01_sfnt_off000066ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66AD 18604 bytes
SHA-256: 0574235514a227558616d3b645e07a1bc7755eae176f5c06de45640ab277ee39

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