Malicious PDF — malware analysis report

Static analysis result for SHA-256 221bfb877c02813b…

MALICIOUS

PDF

43.1 KB Created: 2021-05-13 13:41:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5287a6945df7c0e06699d78eb336f522 SHA-1: bc3a50b65c7c59b0709f82737104cebcfd4e97ac SHA-256: 221bfb877c02813b4516731da73dcc74065d3d68fc42325899997e4dff80f5c6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to websites promoting game hacks and free in-game currency, a common lure for phishing or malware. The heuristic firings, particularly 'PDF_GAME_HACK_REDIRECT_LURE' and 'PDF_MALICIOUS_REDIRECTOR_LINK', strongly indicate malicious intent. While no scripts were explicitly extracted, the document's structure and embedded URLs suggest it's designed to lead users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/479516143/how-to-get-free-tokens-in-minecraft-ps4-game-hack In PDF document text
    • http://uctaren.eu/images/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://uctaren.eu/images/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://uctaren.eu/images/coin-master-2021-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://uctaren.eu/images/free-redeem-code-for-coin-master_GM406889139.pdfIn PDF document text
    • http://uctaren.eu/images/instant-robux_GM431946152.pdfIn PDF document text
    • http://uctaren.eu/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://uctaren.eu/images/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://uctaren.eu/images/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://uctaren.eu/images/moonactive-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://uctaren.eu/images/cm-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://uctaren.eu/images/how-to-get-free-outfits-on-roblox_GM431946152.pdfIn PDF document text
    • http://uctaren.eu/images/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://uctaren.eu/images/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://uctaren.eu/images/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • http://uctaren.eu/images/coin-master-20-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://uctaren.eu/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://uctaren.eu/images/coin-master-spin-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://uctaren.eu/images/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://uctaren.eu/images/coin-master-hack-pc-download_GM406889139.pdfIn PDF document text
    • http://uctaren.eu/images/how-to-use-scripts-in-roblox-hack_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
stream_003_off00004c29.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C29 25580 bytes
SHA-256: e02e4456c8affa3cecab1a0a3d3495507b6e580040c87a733cf614b0533bbf9e
font_01_sfnt_off0000866c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x866C 18260 bytes
SHA-256: 6b17d904edba380b1c0a1521f110ced755ab41ddc916bfb976523684f5146024

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