Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e8cc51d5456f30…

MALICIOUS

PDF

34.4 KB Created: 2021-06-27 14:12:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: db7ef7e878f5efc5bf60f772f20604ee SHA-1: 28ad9f03a2ebac08f97368b994951d0b4eabb114 SHA-256: 23e8cc51d5456f30b965bcabec116f54cf353e298d451b64bdfcf15b4262e1bf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free Robux and game hacks to trick users into clicking a link. The embedded URL, http://netcdn.co/app/431946152/free-robux-just-enter-username-no-verification-game-hack, is identified as a malicious redirector. While no scripts were extracted, the document's structure and embedded URLs strongly indicate a phishing or scamming attempt, likely leading to further malicious content or malware download.

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/free-robux-just-enter-username-no-verification-game-hack In PDF document text
    • http://www.vista-design.hr/files/free-robux-scams_GM431946152.pdfIn PDF document text
    • https://www.vista-design.hr/files/minecraft-free-version_GM479516143.pdfIn PDF document text
    • http://www.vista-design.hr/files/roblox-free-hair-boy_GM431946152.pdfIn PDF document text
    • http://www.vista-design.hr/files/blue-boy-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.vista-design.hr/files/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.vista-design.hr/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.vista-design.hr/files/free-robux-in-roblox-rocash-com_GM431946152.pdfIn PDF document text
    • http://www.vista-design.hr/files/coin-master-free-coins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://www.vista-design.hr/files/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • https://www.vista-design.hr/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://www.vista-design.hr/files/how-to-get-a-shoulder-pet-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.vista-design.hr/files/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • https://www.vista-design.hr/files/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://www.vista-design.hr/files/download-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.vista-design.hr/files/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://www.vista-design.hr/files/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • http://www.vista-design.hr/files/how-to-get-free-animations-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.vista-design.hr/files/free-roblox-card-codes-not-used-2021_GM431946152.pdfIn PDF document text
    • https://www.vista-design.hr/files/discord-server-hoe-to-hack-a-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.vista-design.hr/files/free-account-on-roblox-with-robux-and-bc_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_off00002eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB4 22456 bytes
SHA-256: 00041ddfaf96dda1f4de3f48b2cb95fe3539402d7c308a834fc2386ac8b0afc3
font_01_sfnt_off0000600d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x600D 19500 bytes
SHA-256: b1da4f69a4dbdc588c1e9f50b7edb1fa148f7ac7d069f7fee6d616558a00ca93

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