Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dca51b1834b0c76…

MALICIOUS

PDF

36.2 KB Created: 2021-06-29 16:00:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1f810d77c5772480fd13bdad6891dd3e SHA-1: 2e02d5a5f900126be73f1a150f65c28c5623bcf1 SHA-256: 3dca51b1834b0c769b9a386a9f9a67ebfe5b0f244716419db335b46245414d75
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on offers for free game currency or hacks. The primary link, http://netcdn.co/app/431946152/get-free-robux-now-easy-game-hack, redirects to known malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

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/431946152/get-free-robux-now-easy-game-hack In PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/county-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-daily-bonus_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/is-roblox-hacked_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/robux-game_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/roblox-fisticuffs-hack_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-tiktok-bots_GM835599320.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/roblox-free-hats_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/porque-hackean-roblox_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-tiktok-accounts_GM835599320.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/cheat-engine-max-health-roblox_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/roblox-catalog-free-dominus_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-robux-decal-roblox_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/freespinandcoinblogspot-com-2021-11-coinmasterfreespins_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000034e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34E1 22880 bytes
SHA-256: e740131928c5e5166fdbe0136d0fb55e89594e63ebbb4061a2991195bec62b68
font_01_sfnt_off000067fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67FA 19164 bytes
SHA-256: eb62aab568dbad7e3e9747291f930f24fb1e9f993a7f36c7edf60258b9d4ba12

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