Malicious PDF — malware analysis report

Static analysis result for SHA-256 559a723818581031…

MALICIOUS

PDF

34.4 KB Created: 2021-07-03 15:01:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 05ce4c0678bb0f90f8ae458b6d5084b9 SHA-1: 43bae5ea33d643ae2bf61910cc370da0969d82f9 SHA-256: 559a7238185810315e335bf15435bffd5d43c66c97ea28e222bf689af254e045
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains embedded links that redirect to a URL associated with malicious activity, specifically a 'free generator / game hack' lure. The presence of a visual download button and the ML classifier flagging the PDF further support its malicious nature. The primary attack vector appears to be social engineering via a deceptive lure.

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.tw/app/431946152/free-free-robux-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-gold-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-18-9-hacked-client_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-working-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-and-tix-on-roblox-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/robux-claimer_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/daily-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-app-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/www-roblox-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-minecraft-account-reddit_GM479516143.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
font_00_sfnt_off00003138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3138 22052 bytes
SHA-256: 73f7a3d169653c1e7ff09d2de5ca98d708b693e590d6efc7c657746eae4d1961
font_01_sfnt_off00006236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6236 18716 bytes
SHA-256: ae86725dd70d168e8b5a24377d7effb3bd88f81667aa3e091abc0f5759eb354b

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