Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f54942e8c32bb9…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 23:17:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2199fe679fc4867d27aa0f02dfec3240 SHA-1: 89cc874fe0c88fd40aed683d0ff5af224fd72316 SHA-256: 43f54942e8c32bb9a6ad88de85c3471998963531b7f10554cc1df707cfb8aab5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free game hacks. The primary redirector URL is http://netcdn.tw/app/431946152/free-roblox-boy-hair-game-hack. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious redirection and potential download attempts, aligning with a spearphishing attachment vector.

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-roblox-boy-hair-game-hack In PDF document text
    • http://library.umla.ac.id/repository/roblox-plaza-hack_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-games-like-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/clean-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/wizard-hacks_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-spins-and-coins-com_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-many-levels-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/veste-free-in-game-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-mobile_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-robux-on-tablet-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-4game-club-hack_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_off000030f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30F1 22256 bytes
SHA-256: c4ab65fdc4449f744b3063ff2b72c99a026ed92fdc2a9f9666f20f5d3c495417
font_01_sfnt_off000062aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62AA 18952 bytes
SHA-256: 11abe4f9eab45b4efd387d79c4e816389e309e201b8270674f055c613943c4b9

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