Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4986903713c5bcf…

MALICIOUS

PDF

46.3 KB Created: 2021-06-03 12:59:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 7e80d32dbcdd2ffa4e559c9b6b9e8d03 SHA-1: 90bfb3b1108ac0e174e72d1f8287d7e8c1ade200 SHA-256: c4986903713c5bcf6f65824161242221926efe49df84fa600c46f1b2467a68a5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a prominent link disguised as a 'free generator / game hack' for Robux, which is a common lure for phishing or malware distribution. The embedded URL, https://netcdn.online/app/431946152/free-800-robux-game-hack, is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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 https://netcdn.online/app/431946152/free-800-robux-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/hacks-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/master-free-spin-and-coin-links-html-m-1_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-free-download_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FD1 24632 bytes
SHA-256: 87dccec306131bae409094dfcd5e2176173569f62dd84c7d29efc3e2d7f5dea9
font_01_sfnt_off000087f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87F4 2824 bytes
SHA-256: 1d0cb1023eaa225682b8e7a2c8df4e4c96545ba7eedaf3d9844e51183e9ca189
font_02_sfnt_off000091a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91A0 18396 bytes
SHA-256: 2059a7894931e9b75336f5975f03d939213f3fdb926ff7d6db67df9fd1731cb7

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