Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a18582c44df4bb…

MALICIOUS

PDF

33.6 KB Created: 2021-07-06 07:38:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 977ac2d16612448c24c98bec20d055ff SHA-1: 4fbc272c651d491900ac8c344bc7bb322fe1eaa2 SHA-256: a5a18582c44df4bb8c6ed0c64e9953a2310af933ba5ebf81a17b41c3428c0086
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including a critical one to a known malicious redirector at http://netcdn.tw/app/479516143/how-to-get-minecraft-pe-for-free-game-hack. This URL is presented as a 'game hack' or 'free generator', indicating a social engineering lure to entice users to click. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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/479516143/how-to-get-minecraft-pe-for-free-game-hack In PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-roblox-accounts-that-work-2021_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/websites-for-robux_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/roblox-hack-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-20-roblox-pastebin_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-date-and-time-hack_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/free-games-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/hack-adopt-me-roblox-2021-project-alpha-300_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/how-to-hack-roblox-to-get-emitted-roblox_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/simplysarc_GM479516143.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/lemon-aid-roblox-hack_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/cheats-coin-master-free_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/roblox-games-with-free-vip-servers_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/how-to-get-free-things-on-roblox-catalog_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/face-made-when-roblox-was-hacked_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/dominus-roblox-free_GM431946152.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_off00002fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FAD 22276 bytes
SHA-256: 0faccb2403dea51b5fd1a5aaeb95e5bb55888e552f6c10325dc5086d73e0db01
font_01_sfnt_off00006084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6084 18316 bytes
SHA-256: 6114a01aa91a9ce609c62e178085c324d68f94fc89260c1d3226e785dda6fa61

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