Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c22553cd3bd9c4b…

MALICIOUS

PDF

36.1 KB Created: 2021-07-05 07:53:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3f9acbefec9812542e6fcb7f25b8237b SHA-1: 7c9f0abbf67cad827ad680813e5e85d7f2abe5bf SHA-256: 4c22553cd3bd9c4bc96e442c23b38e15f649f4e85d494753a03b99ab98ec0aff
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The document body and embedded URLs reinforce this by advertising free game hacks and generators, aiming to trick users into clicking the malicious link. The ML classifier also strongly flagged this PDF as malicious.

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/free-spins-coin-master-links-no-human-verification-game-hack In PDF document text
    • http://library.unissula.ac.id/fk/repository/2021-fe-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/lifting-simulator-roblox-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-game-hack-app-download_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-get-roblox-admin-for-free_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/how-do-you-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/minecraft-mod-menu-apk_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/como-hacer-un-free-admin-en-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/oprewards-points-generator_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-exploit-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-arsenal-hacks_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-hack-no-survey_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-its-free_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-free-robux-funky_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-spins-and-coins-coin-master-app_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_002_off000032c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32C6 23824 bytes
SHA-256: 8b0d7fc52c11eb7ba87b621f9c6779920293e30a238313db59889c0692c1e5f3
font_01_sfnt_off0000690b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x690B 18880 bytes
SHA-256: bae7cc3adddbb08ac14a4132461e215e64c81c27f71b43f07da60d570db63156

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