Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e63158dd38d0d8…

MALICIOUS

PDF

43.0 KB Created: 2021-06-03 08:59:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c0162563b1ee3cf14380a72af53d4c87 SHA-1: 5bd55a4d8ee656646768df2bea520bbf8411b7f6 SHA-256: 25e63158dd38d0d88cd32979132ea84e444a8f4063d329fc95b82751068deab2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically promoting 'game hacks' and 'free generators'. The document body and heuristics indicate a lure to download a payload from the provided URL. The ML classifier strongly flagged this PDF as malicious, supporting the observed malicious redirector links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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/real-hack-for-coin-master-game-hack In PDF document text
    • http://library.ulb.ac.id//repository/coin-master-hack-apk-no-fb-login_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/tiktok-free-books-website_GM835599320.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-sexually_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-spins-save_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/minecraft-free-play-now_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/roblox-images_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/best-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/optifine-pe_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-codes-no-verification-2021_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_off00004fe6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FE6 24216 bytes
SHA-256: 71d8ed373658c2eddfe38ca243f6e0be01be8848fa94f0a574318050d4e05d9e
font_01_sfnt_off00008664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8664 17956 bytes
SHA-256: c3bff0caf4b3e4fab2d80157ad4f14f97eaac11d6adb17aae1b51a270053db42

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