Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b19db99be79d6b…

MALICIOUS

PDF

42.3 KB Created: 2021-05-16 18:14:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e7c668de850d1dcd8809d82361bfc906 SHA-1: e89fd28ad0422623fefeacd7f87f8e05d42ac80c SHA-256: c1b19db99be79d6bfba1cdfd9e3df53112d453b004735ef321eedec8f712b6e0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'free spins'. The primary lure URL is https://netcdn.xyz/app/406889139/hack-coin-master-free-spins-game-hack, which is associated with a high-risk score. The document body, though partially corrupted, contains similar lures and additional URLs pointing to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/406889139/hack-coin-master-free-spins-game-hack In PDF document text
    • http://www.ma-plast.hr/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/free-spins-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/minecraft-svg-images-free_GM479516143.pdfIn PDF document text
    • http://www.ma-plast.hr/files/coin-master-free-spin-bonus_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • http://www.ma-plast.hr/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/minecraft-free-reddit_GM479516143.pdfIn PDF document text
    • http://www.ma-plast.hr/files/roblox-cheat_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • https://www.ma-plast.hr/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/robux-free-c_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/robloxbux-us-generator_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/coin-master-online-free-spin_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_off000048ed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48ED 25792 bytes
SHA-256: 02d1258d06078671af225655870475fc13bb51a80b771cc4084d7672a74028bc
font_01_sfnt_off000083b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83B6 18056 bytes
SHA-256: f90826bfe2bc71c0265d319a9184b169c06436e7d3915f152a6a7ecd0e51099f

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