Malicious PDF — malware analysis report

Static analysis result for SHA-256 3997359962e76cd8…

MALICIOUS

PDF

33.9 KB Created: 2021-06-18 15:15:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1fabd94467d49edafd52e9be2cd255b0 SHA-1: d44e72993a4df27d3452c9689b7d55e4c04b5661 SHA-256: 3997359962e76cd8e0e626fb325a3b5dbc5ae3369fcafde1f734e3e0b6d471bf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to websites offering game hacks and free currency, which are common lures for phishing or malware distribution. The heuristic firings indicate these links point to malicious redirectors and the ML classifier strongly flagged the document as malicious. While no scripts were explicitly extracted, the embedded URLs and the nature of the lures suggest an attempt to redirect the user to a malicious site, likely for further exploitation or payload delivery.

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/roblox-ghost-simulator-cheat-game-hack In PDF document text
    • http://unilin21.ru/images/free-robux-download_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/free-robux-android_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-free-spin-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://unilin21.ru/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://unilin21.ru/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/roblox-personal-server-hack_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EF2 21916 bytes
SHA-256: e6c2f9ef7a689550ee7d57bd84b2546dfb7ec9d3c48b61d057e582fc01066f7c
font_01_sfnt_off00005f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7A 19088 bytes
SHA-256: b9dd3e437b224b7be6beea764ff1d4558b4c2c77f7fabc35e7e9fdf0edf8bd95

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