Malicious PDF — malware analysis report

Static analysis result for SHA-256 99104dfa07d4005b…

MALICIOUS

PDF

33.8 KB Created: 2021-07-20 16:21:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c3dcfeae7a375d43fce694788aee7051 SHA-1: 981c9cd244835440c4709860ef16dc600e3bc4de SHA-256: 99104dfa07d4005b37d0ed501c839465a4a8af018790c14e724df8793af07b77
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links designed to lure users with promises of game hacks and free currency, redirecting them to known malicious infrastructure. The ML classifier strongly indicates malicious intent, and the document body's content reinforces the lure. While no scripts were directly extracted, the PDF's structure and embedded links suggest it's designed to exploit user interest in free in-game items to redirect them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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/how-to-hack-roblox-accounts-2021-game-hack In PDF document text
    • http://nep-operationalmanual.com/images/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://nep-operationalmanual.com/images/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://nep-operationalmanual.com/images/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://nep-operationalmanual.com/images/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://nep-operationalmanual.com/images/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://nep-operationalmanual.com/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://nep-operationalmanual.com/images/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://nep-operationalmanual.com/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://nep-operationalmanual.com/images/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://nep-operationalmanual.com/images/free-minecraft-servers-to-join_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_off00002cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CEA 22444 bytes
SHA-256: 304555d68692e47effefb1d260c3ffe1525c9cf08fdbde980bc4cc55471e1856
font_01_sfnt_off00005f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4A 19176 bytes
SHA-256: 6f1be2f53e78d2232c4cc8701dc2ebda7fd96dce4e81a36b526c0c8f5bd1c790