Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa98d4d4674b3da7…

MALICIOUS

PDF

44.1 KB Created: 2021-06-03 10:09:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 11db925e0bcbd489802e7f9e02b372d9 SHA-1: 43f19bdcafaa8bf5631a3b0e73e59402ab4b6ee2 SHA-256: fa98d4d4674b3da7483f4d4f8780d25babdb46e311a20381af0e3b7fb45d1c68
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to websites that are flagged as malicious redirectors, specifically promoting 'game hacks' and 'free currency'. The ML classifier also strongly indicated maliciousness. The embedded URLs likely lead to further malicious content or phishing pages, aiming to exploit user interest in free in-game items.

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/406889139/master-free-spin-and-coin-links-html-m-1-game-hack In PDF document text
    • http://librarysenior.com/repository/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-hair-for-free_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-game_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-tiktok-followers-no-survey_GM835599320.pdfIn PDF document text
    • http://librarysenior.com/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-make-my-own-coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-get-roebucks_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/open-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-daily-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-give-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-hack-coin-master-game-without-verification_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-free-robux-easy-no-download_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_off00005051.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5051 24748 bytes
SHA-256: e1773b066cbdd29887e38a372769fc7d183b83450892d5634c62169bec9134fb
font_01_sfnt_off00008892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8892 18672 bytes
SHA-256: e8e5c78a3c75332e87dcced76b09371611da69ae485f860408bab2f18198baf8

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