Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef4cef418a2c268…

MALICIOUS

PDF

34.2 KB Created: 2021-06-29 16:19:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8ba1b19424dd122a7591135f90c31e0f SHA-1: 552eb0331cde13a7bcb6ef18798b2955a3cc12b6 SHA-256: eef4cef418a2c268113a71f262d604b23640dc77183ebe90ad8c9000c87b72c2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically advertising 'free generators' and 'game hacks' for popular games like Roblox. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it uses a known malicious redirector. The document body and embedded URLs suggest a lure for users seeking in-game currency or cheats, which is a common social engineering tactic.

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/431946152/100k-robux-hack-game-hack In PDF document text
    • http://lib.fisipumt.ac.id/repository/coinmaster-fan-page_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-apk-download-free-11-055_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-on-roblox-on-pc_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/pubg-500-uc-price_GM1330123889.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-connection-lost-hack_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/tiktok-free-nose-job_GM835599320.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/what-are-points-for-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/wwwcoin-master-free-spincom_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hack-rc7-roblox-download_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/how-to-hack-coin-master-using-es-filer_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-hacked-apk_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/telecharger-roblox-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-hack-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-easy-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/real-free-robux-generator_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_off00002ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC9 22320 bytes
SHA-256: 1eb46e40e9338475bfbb6afa9fbb627988796789002df2b9d54aaadbfc90c496
font_01_sfnt_off0000608e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x608E 19000 bytes
SHA-256: 054ab32adab12a87bec857b79a134802748865048dc95872c04cb3f08511877e

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