Malicious PDF — malware analysis report

Static analysis result for SHA-256 be553356008dbee9…

MALICIOUS

PDF

35.6 KB Created: 2021-07-05 17:06:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 13e65312633184344b927f46e95f130a SHA-1: e50c1f8f5718205bdf8cad8dc8fe69d04c991c0a SHA-256: be553356008dbee941088ea3937de8158615f581fd3fbbe46a1ffb9ebc9e0a75
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/406889139/coin-master-free-shield-game-hack. This lure is designed to trick users into believing they are accessing game hacks or generators. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to 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/406889139/coin-master-free-shield-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/tiktok-free-view-iphone-survey_GM835599320.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-sexually-abused_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-heaven-links-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/f-r-e-e-that-spells-free-roblox-id_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/latest-free-spin-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/code-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-use-slayer-leecher-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hack-coin-master-2021-pc_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-cheats-pc-2021_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-more-followers-on-tiktok-free_GM835599320.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/horrnoclip-hacks-roblox_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
stream_002_off000033e8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33E8 23288 bytes
SHA-256: 7e9b5a36ee7902db51b377844897fd47b86d3ac4174e9bfbd01fa5f52bd06b22
font_01_sfnt_off0000683f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x683F 18412 bytes
SHA-256: 0587c5ea293d6466c2874a15d5d2b3fb54518ca93cb1aa8e833a12ae5a1a4040

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