Malicious PDF — malware analysis report

Static analysis result for SHA-256 b148fc7143045ebb…

MALICIOUS

PDF

43.0 KB Created: 2021-06-04 01:24:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 05245fbc4329746f47229662b4c8fffa SHA-1: 56b601acd946d9ae682900f41c780aa34562ddb4 SHA-256: b148fc7143045ebb302254432901a379a7a57e8ffa920d723f3901e2469022e9
200 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links that redirect to malicious infrastructure, masquerading as free game generators or hacks. The document body and heuristics indicate a fake CAPTCHA or human verification prompt is used to lure users into clicking these links. While no scripts were extracted, the presence of malicious redirectors and the fake verification prompt strongly suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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/406889139/50-free-spins-coin-master-links-game-hack In PDF document text
    • http://lib.stimykpn.ac.id//repository/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-support_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-apk-114_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-com-roblox-play-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-hack-apk-35-33_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-34-4-hack-download_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/60-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-free-items_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/robux-hack-2021_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_off00004dcd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DCD 24060 bytes
SHA-256: eb1f6567ec8e4268fb5a5bd35517a3580cf9ac64ffb6d9a499eb7a850a63cfd0
font_01_sfnt_off00008512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8512 18364 bytes
SHA-256: 5f18526dee368ac18b20cf023ba1ff49340788242d54a3837ea53eed50d07245

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