Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffe784f77dff5527…

MALICIOUS

PDF

35.6 KB Created: 2021-06-23 06:02:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e42b65d0bf16c84f3657293c28ac9224 SHA-1: 45cf1908956d52546d9cd576840f2f7fdf7ad611 SHA-256: ffe784f77dff5527f3c143c7776037ac5aaaabaaf4a37df8e3d31115ff304285
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 redirector. The document body also contains the same URL, reinforcing the lure. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirect URL.

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/479516143/minecraft-games-online-free-no-download-game-hack In PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-send-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-time-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/oprewards-login_GM431946152.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spin-link-coin-master-app_GM406889139.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-tix-and-bc_GM431946152.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-time-hack-ios_GM406889139.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/cool-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-download-today_GM406889139.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/download-hacked-games-com-coin-master_GM406889139.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox-2021-hack_GM431946152.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/how-do-you-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-verifying_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_off000034ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34CA 22512 bytes
SHA-256: 2d19cf32d82380459466627ca92817a1ff3125a467aa6a3f0cda131eddff36f5
font_01_sfnt_off0000670d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x670D 18840 bytes
SHA-256: 0f63a3180c461c096085b6d31a5d28a282e0ae722758aa9b018515a408144b72

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