Malicious PDF — malware analysis report

Static analysis result for SHA-256 8965e367502ba1d3…

MALICIOUS

PDF

43.9 KB Created: 2021-06-03 13:02:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5f8b426dc55a589ce7ee089575f50e76 SHA-1: 6dde69197609aa58c951c377d965175e61121bd2 SHA-256: 8965e367502ba1d3af27a19203ebb31a1f7919e1531c7e0089b18003ceef2c57
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a fake CAPTCHA lure to deceive users into clicking a link. The primary link, 'https://netcdn.online/app/431946152/free-robux-reddit-game-hack', leads to known malicious redirector infrastructure. The document's content and heuristics suggest an attempt to exploit user interaction for potential further compromise, likely through a downloader or exploit. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-robux-reddit-game-hack In PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/coin-master-free-coins-link-facebook_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/roblox-rewards-site_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/minecraft-free-version_GM479516143.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/coin-master-free-link-daily_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/how-you-get-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/roblox-free-body_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/daily-coin-master-free-spin-link-facebook_GM406889139.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://pustaka.stie-pembangunan.ac.id/repository/buy-robux-free_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
stream_004_off00005095.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5095 24476 bytes
SHA-256: ced54d1f16aa2d6da1b732360448fc4c86acda2e8ec9c7a9107e1fc92b86cea8
font_01_sfnt_off00008884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8884 18412 bytes
SHA-256: c557a72efce44f866a9d9d033701dfd5e052f904d36d096978818f2976e16735

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