Malicious PDF — malware analysis report

Static analysis result for SHA-256 5580bef5d67847c6…

MALICIOUS

PDF

33.4 KB Created: 2021-07-04 10:49:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4eeff30f81e50bd0a6511ae2f3f637b5 SHA-1: f8a0abd5049e06ea8eeec4e949d1657dd7dc52a8 SHA-256: 5580bef5d67847c69bbc3b8e7fa3dfc6a32abf4351f3c947555e7bef8e30bfff
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free coins' and 'game hacks' for popular mobile games. The ML classifier strongly flagged this PDF as malicious, and the presence of a visual download button lure further supports a malicious intent. The primary goal appears to be directing users to malicious sites via the embedded URLs.

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-coins-coin-master-ios-game-hack In PDF document text
    • http://library.acehresearch.org/repository/como-ser-hacker-en-roblox-en-movil_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-mod-menu-free_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-hack-engine_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-lost-world-2021-com_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/five-games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/robux-hack-us_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/earnrobux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/houe-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-robux-easy-and-no-generators_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-skins-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-detecting-cheat-engine_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/robux-no-verification_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-minecraft-codes-2021_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-use-cheat-engine-without-roblox-shutting-down_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-spins-for-free-on-coin-master_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_off00002f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F10 22248 bytes
SHA-256: 22de195c46f66f38ffdff0b5b31290c06ee000f61a1484e8ac4ce5b3ebfb10ec
font_01_sfnt_off0000608a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x608A 17996 bytes
SHA-256: 89cbfc78b6b64325627d68645665868ebb223b7d98690681809d971a84d5890e

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