Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4fff6243738d66…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 05:21:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5fca327bc74aeb3cf6b4c8c6b7a734aa SHA-1: ae84e52029bd95f7fb75932abe1b3c073623f2ff SHA-256: ca4fff6243738d669d4edf9c02de739d65fe5248ec3093aa6e3bb355d5a44332
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'game hacks' and 'free generators' for popular games. The primary lure URL is http://netcdn.tw/app/431946152/how-to-get-robux-without-human-verification-game-hack, which is associated with malicious redirector infrastructure. The document body and embedded URLs suggest a social engineering tactic to trick users into downloading potentially harmful content.

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/how-to-get-robux-without-human-verification-game-hack In PDF document text
    • http://library.umla.ac.id/repository/alone-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/can-you-download-roblox-on-ps4-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-free-version_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-roblox-soldier-gfx-ww2-german_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-apk-android-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-app-free-download_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/face-png-roblox-free-face-q-se-queda-para-siempre_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-no-verification-or-sign-up_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spins-hacktman_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_off00003012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3012 21964 bytes
SHA-256: 8de24c2fba9f367c84baecdbc6a7057deed495738660f77cff9c0760cd5592c7
font_01_sfnt_off0000609a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x609A 19700 bytes
SHA-256: 64484b6d29a4920bc8c12342f3d68dd62a058b625ff4da7088e278cca2f2c5da

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