Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef97b762dd3e4687…

MALICIOUS

PDF

42.6 KB Created: 2021-05-16 11:50:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8a612787232e344f0cb81c6b28b52d48 SHA-1: aca2a5459d6f51c7b5e98660a8c7d0c0dd77c1c9 SHA-256: ef97b762dd3e4687b501dbe25b0e83a18868f64694bf4fb014ebe43892104be5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a known malicious redirector, disguised as "free generator / game hack" lures. The document body and embedded URLs strongly suggest a phishing or scam attempt, likely to lead users to sites offering fake cheats or currency for games. No scripts were extracted, but the presence of malicious links and the lure indicate a high likelihood of a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-scams-game-hack In PDF document text
    • http://unilin21.ru/images/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-500-free-spins_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-hack-tool-v1-9-download_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/free-robux-come_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/mistplay-robux_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/www-coinmaster-com_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://unilin21.ru/images/hackear-coin-master-espaol_GM406889139.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
stream_003_off0000475f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x475F 26296 bytes
SHA-256: 7d4c031f3a7c5a94be918eeed0ab0f092e01a877900c5c8d05a3899184642c35
font_01_sfnt_off0000839f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x839F 18500 bytes
SHA-256: f6eebadb3de4af7ab0205057cc55fc1daf9397692da1370c2a19d2d749ad11f1

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