Malicious PDF — malware analysis report

Static analysis result for SHA-256 2519133b335129e5…

MALICIOUS

PDF

34.9 KB Created: 2021-07-06 02:35:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e3999dcc53ce5b54c50b0cf0512519ed SHA-1: cdc4382f9dbf6b12f8d15fddc5dd1087870b3cfd SHA-256: 2519133b335129e5a3d52bf7f3d654a843a8b4178cc35a941c758a8ac57b1a65
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically targeting users with lures for game hacks and currency. The primary link, http://netcdn.tw/app/431946152/free-robux-easy-and-fast-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the document's structure and embedded URLs strongly suggest a phishing or social engineering attack aimed at driving traffic 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/free-robux-easy-and-fast-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-aockolupse-hack-mod-menu_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/bloxburg-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hahow-to-hack-roblox-fly-on-sky-ward_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-robux-hack-online-generator-tool-no-download_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-how-to-get-free-gift-card_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-vip-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-spin-coin-master-link-download_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-hack-a-roblox-account-2021_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_off00003070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3070 22496 bytes
SHA-256: e4e4eea0a2b29b457361f886b7a1f04347b181184873d04b447dd2995e1104b5
font_01_sfnt_off000062da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62DA 19172 bytes
SHA-256: e478a87f33177f62414f41e8523dd2647ca5964d0e32b68d8766533df2c128b7

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