Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fc03112cee14a9…

MALICIOUS

PDF

44.1 KB Created: 2021-06-03 18:22:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 488f689c377bac31abf3afa81d563e97 SHA-1: 6d6650c25fe8d6bc131a0519cdfd3858f8901a92 SHA-256: a0fc03112cee14a9517e379ff1cae8f7d2ea8a6d8b4ac8f74819d079a962fd3d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically promoting 'game hacks' and 'free spins' lures. The ML classifier strongly indicated maliciousness, and the presence of multiple redirector links confirms a malicious intent to lead users to potentially harmful sites. No scripts were extracted from this sample, but the document's structure and embedded URLs are indicative of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/roblox-earn-game-hack In PDF document text
    • https://www.wcauk.org/uploads/files/files/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/robux-miner_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/easy-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-gfx-roblox_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/earn-roblox_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-free-100-spin-link_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-tiktok-fans_GM835599320.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/how-to-get-stuff-that-cost-coins-free-mcpe-master_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/www-rubux_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_004_off00004fc1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FC1 26592 bytes
SHA-256: 623eb16ddd93129b285e6df9842c9946bd2538908d6c13b6fec4082019086f5f
font_01_sfnt_off00008a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A9A 18012 bytes
SHA-256: 42531263983f6693088f3a8f454b6124c238abf7e5f906b9b909f7807833e74e

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