Malicious PDF — malware analysis report

Static analysis result for SHA-256 277823594a9acd9f…

MALICIOUS

PDF

34.6 KB Created: 2021-06-20 03:21:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a396f6eccbb6336a31407ebcc51c84a2 SHA-1: 7efe4d75f28c01f336893207403ac8fe9862e126 SHA-256: 277823594a9acd9f5fd891e045dd230eb7cb98eabcb7f6223502a50908e6ea19
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, disguised as a lure for free game currency and hacks. The primary malicious URL identified is http://netcdn.co/app/431946152/how-to-get-free-roblox-dollars-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or scam attempt, likely leading to further malware download or credential harvesting.

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/how-to-get-free-roblox-dollars-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/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-robux-cheats-2021_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/how-to-hack-and-get-robux-and-vip-no-survey_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/roblox-free-avatar-stuff_GM431946152.pdfIn PDF document text
    • https://www.armera.co.uk/uploads/files/files/was-minecraft-ever-free_GM479516143.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_off00003067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3067 22252 bytes
SHA-256: 8f4218b87fc502cef6ba439b1b1af4b2fc8d139213a9140e02a438c1189bcf4f
font_01_sfnt_off00006225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6225 19084 bytes
SHA-256: 201822c377c913ebc508d5d711d3c16130febf184a5dbc64793f0fa3cd87d558

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