Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d95ecbfd6a05d03…

MALICIOUS

PDF

50.9 KB Created: 2021-05-20 00:01:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3cf07d79e9f93ada34a4d2f48fc1f423 SHA-1: 79bea445137c965ca9a733e69526c23546a2a425 SHA-256: 9d95ecbfd6a05d03f7bf2408a42b4d67427878245439017a8bc230a4fb5b98d0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures related to game hacks and free generators. The primary malicious URL identified is https://netcdn.xyz/app/431946152/robux-com-free-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or scam attempt designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9348

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.xyz/app/431946152/robux-com-free-game-hack In PDF document text
    • http://zercalo.org/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-do-you-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/abd-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/link-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/add-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-apk-hack-35-8_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-avatar-maker-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4864 38184 bytes
SHA-256: 7235b2bdecf35c440dedd2bf6d8cbd514b9c8593ce86e8ab9a94234bccf9e49f
font_01_sfnt_off00009b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B38 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off0000a522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA522 18276 bytes
SHA-256: 15a0db03ecad41b32ad15729058012b5ee1d917146ec7af3e780186d41394abc

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