Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b494e1ce84f778a…

MALICIOUS

PDF

44.3 KB Created: 2021-06-03 13:35:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 67a425a626ad05afa2bf48ada407b713 SHA-1: 71afdd63eecfdd655781a3c3a4b0fe5914caf5a8 SHA-256: 3b494e1ce84f778a5555824058f1d0db9daf3869f9e4ab8880f018b4b84c89aa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising "free generator / game hack" lures. The primary IOC is the redirector URL https://netcdn.online/app/431946152/whats-robux-game-hack, which is designed to lead users to potentially harmful content or further malicious downloads. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a social engineering attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/whats-robux-game-hack In PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/xray-hack_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/real-coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-tiktok-followers-app_GM835599320.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/daily-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-tik-tok-2021_GM835599320.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-extra-spins_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-spins-coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-robux-app_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-spin-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-get-free-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
font_00_sfnt_off00005098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5098 25476 bytes
SHA-256: e490d2a2e850fd247cc7d1ad3717a49fcc1a817aedbf628af3d769c8a4f39c4d
font_01_sfnt_off000089b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89B0 18548 bytes
SHA-256: 0f5696d834c6e2d92691ea88add56d1ebde531c0848fc2381b30e525a3a87f9e

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