Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ad5e7fa54ea30c…

MALICIOUS

PDF

36.6 KB Created: 2021-06-22 19:03:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d28db41a1bc61c2bf9a2d3c45a65c59e SHA-1: e84f97630b2c7d6b30bb4e07adcf4cee8f2d5776 SHA-256: e7ad5e7fa54ea30c9716feb69db603fa4d9a73a1508f90a6e038a44b05136698
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a known malicious URL. The document body also contains this URL and references 'free generator' and 'game hack' themes, aligning with a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

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/406889139/coin-master-free-stuff-game-hack In PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/wurst-commands_GM479516143.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-hacktman_GM406889139.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-spin-link-free-download_GM406889139.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-apk-hack-358_GM406889139.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://www.heathcote.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-robux-for-free-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_002_off00003747.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3747 23704 bytes
SHA-256: 99fcff72fdcf92a859f9cc5aa471452e25f5de220b286a784765cc762848f0db
font_01_sfnt_off00006d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2B 18140 bytes
SHA-256: ffbe3bd5e7ca89ebd9867be994f107e79cc056fa0179a9297eb86efc4e13e545

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