Malicious PDF — malware analysis report

Static analysis result for SHA-256 58581f0b5d3cf81d…

MALICIOUS

PDF

47.9 KB Created: 2021-06-03 10:57:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a867db963cec39c55858bd7f5de84d3c SHA-1: ce818efb65225dfc5ed23c6218496aefb7641193 SHA-256: 58581f0b5d3cf81df8a3f3b8dacd3464c926f8ec9e0745cc69f27bb7624e2bc2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack lure, directing users to a known malicious redirector URL. The ML classifier also flagged the document as malicious with high confidence. While no scripts were extracted, the document's structure and embedded URL strongly suggest it's designed to lead users to a malicious site, likely for credential harvesting or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.online/app/406889139/coin-master-free-spins-hack-without-human-verification-game-hack In PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-www-com_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/pubg-8-uc-buy_GM1330123889.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-game-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-codes_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/robux-scam_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-apk-free-download_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_004_off000052dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52DD 24976 bytes
SHA-256: 7e4ca303b6e7fd9fe3c82ce25b3466f06780bcf10fef68720822a79477ec69ce
font_01_sfnt_off00008cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC1 2920 bytes
SHA-256: 64c53edae7920bc04119553d13e7f88c7ab8c9d6abd0f5e62be35afdb33f76ff
font_02_sfnt_off000096dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96DC 18952 bytes
SHA-256: bbe995309b6761320a89de429a491d1b27525b5c8b766f3497e3cab7bbe78ffa

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