Malicious PDF — malware analysis report

Static analysis result for SHA-256 16869361990a6cf5…

MALICIOUS

PDF

43.7 KB Created: 2021-05-13 09:00:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ff9934346d0be0b9b8c9f1e43457b655 SHA-1: 97f0014f0e907a23d1d6e5d06fa44be1ac9855de SHA-256: 16869361990a6cf56fd018329403a8ff2a1e8dde54137ba7620cdd9f5bd0e192
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a redirector URL that masquerades as a free game hack generator. The ML classifier strongly indicated maliciousness, and the presence of multiple redirector links reinforces this. The document's content and embedded links suggest a phishing or scam attempt to lure users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/431946152/free-robux-mobile-game-hack In PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/daily-free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/minecraft-free-school_GM479516143.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/roblox-g_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-roblox-clothes-templates_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coin-master-free-spins-link-download-ios_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-robux-generator-2021-no-human-verification_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_003_off00004ad8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AD8 26264 bytes
SHA-256: 90ec4b2f2be0fe068835514ecef052dc6102b3e8a5ded4d626934d51de59a08c
font_01_sfnt_off00008875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8875 18404 bytes
SHA-256: 0c312729e80e6e0ca2ee9f4904992f86151ccd5d23fc73e43cbe09e8497f8a48

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