Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2544d9a3a368e1…

MALICIOUS

PDF

33.5 KB Created: 2021-07-05 02:10:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0aa5e9e9f3cd3e04727d76a01f4ea15f SHA-1: 09f56eacb78f06c3e86a32cb005b1bccc4c6bf84 SHA-256: 9f2544d9a3a368e1063e4153129bcc833d4cc17101ecf2a44cc685133155792a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it links to malicious redirector infrastructure, specifically promoting 'free generators' for games like Coin Master. The document body contains a prominent URL that serves as the primary lure. While no scripts were extracted, the PDF structure and embedded links strongly suggest a social engineering attack to redirect users to potentially malicious 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/406889139/hack-coin-master-no-verification-game-hack In PDF document text
    • http://lib.unwahas.ac.id/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/coin-free-master_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/minecraft-windows-10-hack-client-2021_GM479516143.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/how-can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/coin-master-hack-without-downloading-apps_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/coin-master-hack-version-ios_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/minecraft-pe-free-download-android_GM479516143.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_off00002dc0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2DC0 22672 bytes
SHA-256: 471b21ef2c3d947de85aa6eeaa4e9d5a1ddc692d91ada67857276d41b5c319a3
font_01_sfnt_off00006088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6088 18140 bytes
SHA-256: 5b3c035cf64492e5b5586417bea35dada4cf9862e5f7b0f914ffcce4b3dd02fc

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