Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d1f521fce13f61…

MALICIOUS

PDF

40.5 KB Created: 2021-05-24 22:47:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 844c5023c29b2d6390d3142aea55081e SHA-1: 7e286997a4ea8242c6bbc8ccad7c5c2ed9eb5a50 SHA-256: 66d1f521fce13f618d1e8658b68efbbca3a9fcabc054a9b97267df40f43df058
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free Robux' or 'game hacks'. The document body and heuristics indicate a lure to trick users into clicking these links, likely to download a malicious payload. The embedded URLs and the nature of the lure suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7776

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/free-robux-no-verification-game-hack In PDF document text
    • https://www.cayosalinas.com/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cayosalinas.com/images/mc-hacks_GM479516143.pdfIn PDF document text
    • https://www.cayosalinas.com/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.cayosalinas.com/images/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://www.cayosalinas.com/images/free-spins-and-coins-coin-master-2021-link_GM406889139.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
stream_002_off0000335d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x335D 27052 bytes
SHA-256: 91b9bc42e69289e80d05eade5cb66d99fd0a60884ae645149488fdfb0093589a
font_01_sfnt_off0000724c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x724C 2820 bytes
SHA-256: d88f25cfe237a714f996150a11dd8a058f0f7c3e9d1ae91c17b46c10409b6c0b
font_02_sfnt_off00007be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE6 18600 bytes
SHA-256: 361892a278de990f6dfe9fe9f512a0ec39aeba1740037781b92f32c6ad2b5051

Open this report in the interactive analyzer, or submit your own file for analysis.