Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc13b2e802b746e…

MALICIOUS

PDF

34.3 KB Created: 2021-06-30 22:49:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 34f2d381d07f0d24005c425ced0f3ca8 SHA-1: 84a9a5f867eacfd23e7289667bd8eb22c6844b3d SHA-256: 9cc13b2e802b746e9efa4ea6e683c72f8ecf77189235eeafcb7132a5f7aaa593
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to a known malicious infrastructure, likely serving as a lure for free game items or hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button heuristic further supports a deceptive user-interaction workflow. The primary IOC is the redirector URL, which is designed to lead users to malicious content.

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.co/app/431946152/free-robux-without-offers-game-hack In PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/hack-roman-aegyptus-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/play-free-roblox-war-games_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-unlimited-spin-apk-free-download_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-get-tiktok-famous-free_GM835599320.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-daily-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/pet-trainer-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-get-free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-earn_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-no-human-verification-on-ipad_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-sex-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-roblox-hack_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
font_00_sfnt_off00002e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E62 22320 bytes
SHA-256: 2e3bd6464db3cb3314b49593d8f030997d0e9cfbe1dd4fb1f27a9c304a8ca897
font_01_sfnt_off0000601c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x601C 19304 bytes
SHA-256: d28279064c80375efd82c55b38a8139998c8ec291e9a82c1a232f0005e70f64e

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