Malicious PDF — malware analysis report

Static analysis result for SHA-256 81eb42d6ccb9a1ba…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 10:21:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d9ef5a285b7ed1879537b3462475e4ba SHA-1: d9cc8ff05bf8e04585c0b0d300d944a8343e92af SHA-256: 81eb42d6ccb9a1ba250bb2d236a5753f306c8d454a99ce4b319855e3ad1a7bd5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to a known malicious redirector infrastructure, specifically advertising a 'Coin Master Hack Tool'. The document body and heuristics confirm the intent is to trick users into downloading a malicious application. While no scripts were directly extracted, the nature of the lure suggests a potential for further malicious execution, possibly via embedded JavaScript or external links.

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-hack-tool-v1-9-apk-game-hack In PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-hacks-for-pet-food_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-admin-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-bubble-gum-sim-hack-2021-june_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/good-softwares-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-hacks-vermillion_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-spins-coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/attack-hacker-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/hackaron-roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/give-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-hack-without-verification-code-2021_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/hack-version-of-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-hack-apk-facebook-login_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-roblox-account-password-and-username_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-robux-app-com_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_off0000330d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x330D 22424 bytes
SHA-256: e14a6acbc7a64160c026ae60e1496be7668cd8be64cec31943954df83c677e10
font_01_sfnt_off000064c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64C2 18660 bytes
SHA-256: 56303692e1f284d5036f2cf72873b43e2bb0894e04ed6b7a74506240a39f7b95

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