Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f50fe43ca4c2585…

MALICIOUS

PDF

45.0 KB Created: 2021-05-11 07:36:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 113ffbc16fa4b3a6d9ceb2ad6ffa86e8 SHA-1: 34f74291afc3f91f302bb9b05adf8400718e99ae SHA-256: 8f50fe43ca4c2585f403e4760fe7d471ddc3112588dd4c84b43c5db34de6f9aa
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with the promise of game hacks or free rewards. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_GAME_HACK_REDIRECT_LURE' strongly indicate a social engineering attempt to lead the user to malicious infrastructure. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the document's structure and embedded links suggest it is designed to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.xyz/app/406889139/free-rewards-coin-master-game-hack In PDF document text
    • https://library.kysm.edu.my/repository/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-hack-spins-ios_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/omplete-surveys-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-hack-2021-apk-download_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-hack-apk-35-18_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/does-roblox-premium-expire_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/whats-robux_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/free-spins-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/robux-download_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-70-spin-link-2021_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
stream_003_off00004a62.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A62 24996 bytes
SHA-256: 92d658cba66a20db646d8cd7fe54b0f0b42629a2a37eee27b9dbaec3f28ef0f4
font_01_sfnt_off000083b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83B2 2964 bytes
SHA-256: 519658bd611349ff160735d225bec0e07e02b71cb0dcfae8af0a85be1b41d466
font_02_sfnt_off00008df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF9 18048 bytes
SHA-256: d52e1ade79c91b20aaae42cc68d8a6fc3da24a75956dc290bca91eb62f279afe

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