Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c3b51f569bfe22…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 14:47:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: caa2232ff446468702197e62fbedaa0a SHA-1: 70e2465125c44aa54929e4f65bfa078a6dc7424d SHA-256: e5c3b51f569bfe2238ec0846595cbb82b727e97fb8c589c992b771544bdc695d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'game hacks' and 'free generators' for popular games. The heuristic firings confirm these links lead to malicious infrastructure and are designed as lures. While no scripts were explicitly extracted, the nature of the links and the ML classification suggest a malicious intent to redirect users to potentially harmful sites.

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/431946152/roblox-free-online-no-game-hack In PDF document text
    • http://pustaka.pn-calang.go.id/repository/roblox-free-iron-man_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/how-to-ruux-robux-for-free-grantz_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/lua-roblox-hack-scripts_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/gamepasses-free-pastebin-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/script-executor-roblox-free_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coins-master_GM406889139.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/how-to-get-free-clothes-on-roblox-on-ipad_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/free-tiktok-fans-and-likes_GM835599320.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/nopde-engine-64-roblox-hacks-download_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-free-spins-april-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/free-robux-games-on-roblox-real_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/roblox-how-to-change-your-name-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off000033c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33C2 21756 bytes
SHA-256: 68e4b0f5709ae9aea96256f97d3f41f8218754e1910642198714eeaab5499391
font_01_sfnt_off000063ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63AE 18768 bytes
SHA-256: 103ef32427906f5d65c55005c8a28366293b8e4184bee67e19fa46a6dc934137

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