Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a51255a04e5e6c…

MALICIOUS

PDF

34.4 KB Created: 2021-06-29 23:37:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e29cc8d1e154740fa1a74f3d6a3ab24b SHA-1: bb2d358c292e411f5aec8e9dc4ecc2f80261de13 SHA-256: c3a51255a04e5e6cde57d6ed626b4a4d154f798392b360d80b2c1ab32ae5fc4e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free game hacks and in-game currency. The document body and embedded URLs suggest a phishing or scam attempt, likely leading to further malicious content or credential harvesting. No scripts were extracted, but the presence of malicious links and the ML classifier output strongly indicate malicious intent.

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-do-you-change-your-username-on-roblox-for-free-game-hack In PDF document text
    • http://www.eucorro.com/arquivos/files/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-get-free-robux-items-with-this-admin-code_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/admin-commands-script-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-get-free-admin-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/boys-hair-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/coin-master-games-download-free_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/hack-avatar_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-foxy-food-coin-master_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://www.eucorro.com/arquivos/files/how-to-get-minecraft-java-for-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_off00002f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F74 21796 bytes
SHA-256: 5794714538bca587743c5d074845026bc49bfc3e25618180875f55a1a6dcdb6f
font_01_sfnt_off00005fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBD 19712 bytes
SHA-256: 8f910c94979a9d6798050703d1679800fe6ff1fc7298f4f570a274acd2c00549

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