Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed903664f89accb1…

MALICIOUS

PDF

34.3 KB Created: 2021-06-23 13:13:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cf31fb5cd66a7ee627595174e25548d2 SHA-1: 6bc147d11b82c7f6809213d7c6efaf88c5bd5752 SHA-256: ed903664f89accb191033c1219b37f0eacbc4bd1aa8bd3daea27e618e54ba57b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a known malicious redirector infrastructure, specifically advertising 'free Robux generator' and 'game hacks'. The ML classifier strongly indicated maliciousness, and the heuristics confirm the use of a redirector to lure users to potentially harmful content. While no scripts were explicitly extracted, the nature of the embedded links and the lure suggest an attempt to deliver a second-stage payload or phish for credentials.

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.co/app/431946152/free-robux-generator-2021-no-download-game-hack In PDF document text
    • https://pustaka.widyakartika.ac.id/repository/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/wizard-hacks_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-cheats-carry-music_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-roblox-accounts-november-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-hack-2021-september_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-roblox-party-printables_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-unused-roblox-game-cards_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-mod-apk-free-download-for-android_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-getting-hacked_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-chrome-extension-hack_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/shadowrun-skip-cheat-codes-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-stuff-in-roblox-the-game_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_off00002d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D80 22072 bytes
SHA-256: f11b578f897d5ba86cacaeacd7fefa4b06b063c6e0fab9e1984a72888d7a6a3c
font_01_sfnt_off00005e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E61 19804 bytes
SHA-256: dff176e2ae4455f552f91ba8001728cdcae5447b2ca69b9cf28068a4ac4ff5cb

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