Malicious PDF — malware analysis report

Static analysis result for SHA-256 599ffd5c86784476…

MALICIOUS

PDF

31.7 KB Created: 2021-07-29 23:31:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d97391b081d27cddcd3c138597713cb3 SHA-1: 0973c2b6331802fba43e4f6f66e535638f5cb022 SHA-256: 599ffd5c86784476d7aa66f989162350f8c3d6d01f44b252c39654499160e5dd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a prominent link to 'http://netcdn.tw/app/431946152/free-robux-co-game-hack', identified as a malicious redirector. The document body and embedded links further reinforce this lure, presenting a 'free Robux generator' or similar game hack as a pretext to drive clicks. While no scripts were extracted, the PDF's structure and embedded links strongly suggest an attempt to redirect users to malicious sites, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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.tw/app/431946152/free-robux-co-game-hack In PDF document text
    • https://www.e-learningman18jakarta.com/__statics/gudangsoal/files/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.e-learningman18jakarta.com/__statics/gudangsoal/files/free-robux-please_GM431946152.pdfIn PDF document text
    • https://www.e-learningman18jakarta.com/__statics/gudangsoal/files/free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://www.e-learningman18jakarta.com/__statics/gudangsoal/files/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • https://www.e-learningman18jakarta.com/__statics/gudangsoal/files/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.e-learningman18jakarta.com/__statics/gudangsoal/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://www.e-learningman18jakarta.com/__statics/gudangsoal/files/free-tiktok-views-no-verification_GM835599320.pdfIn PDF document text
    • https://www.e-learningman18jakarta.com/__statics/gudangsoal/files/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • https://www.e-learningman18jakarta.com/__statics/gudangsoal/files/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • https://www.e-learningman18jakarta.com/__statics/gudangsoal/files/how-to-get-free-robux-easy-no-download_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_off0000297d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x297D 21944 bytes
SHA-256: 1c43f3bc0ab0979d534a04104d9ce1bdc81fb9c14fa803c17bac2378d0ed10ad
font_01_sfnt_off00005a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A01 18200 bytes
SHA-256: af0a6f01588019b38fd5688102a8ebe17e4b5155afa3360a762aee3dff872896

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