Malicious PDF — malware analysis report

Static analysis result for SHA-256 f565c3e54072546f…

MALICIOUS

PDF

47.3 KB Created: 2021-06-03 09:57:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5790b3b22350c56189822a0510425dc3 SHA-1: a98f09d14a51e486be297a2767828ee31774559d SHA-256: f565c3e54072546f306f5830e0cb6808351e47359113b3cb4683a0581f68717e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'game hacks' and 'free generators' for popular games like Roblox and Coin Master. The primary lure URL is https://netcdn.online/app/431946152/roblox-hack-codes-game-hack, which is flagged as malicious. The document body, though partially corrupted, contains references to these lures and the authoring application, suggesting a social engineering tactic to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/431946152/roblox-hack-codes-game-hack In PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/free-robux-picture_GM431946152.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/village-4-coin-master_GM406889139.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/free-things-on-roblox_GM431946152.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/minecraft-pe-hacks-ios_GM479516143.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/how-to-get-free-tiktok-coins_GM835599320.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/can-you-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/free-spin-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/coin-master-spins-gratis_GM406889139.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/how-to-hack-roblox-to-get-robux_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_004_off00005403.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5403 29172 bytes
SHA-256: cae3ac85825a58ab489af216f841540a5f5c14ec67d9634a8f53388532539f80
font_01_sfnt_off00009610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9610 18356 bytes
SHA-256: 248f759c619fe1c96c576728ba71c16d7d0933fc88833f740ae7987d47f6eb68