Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99f054131578d59…

MALICIOUS

PDF

41.3 KB Created: 2021-05-12 12:12:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-14
MD5: 73b446563a4a356f00fda288695044ce SHA-1: fc8e3b24b350eab2c9af235a375b944ddd091de9 SHA-256: f99f054131578d5911c135666811819f721e51e583b91df02cf82eb017692eef
220 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/free-spin-gratis-coin-master-game-hack In PDF document text
    • http://perpustakaan-stikesmsb.com/repository/roblox-promo-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-minecraft-java-edition-account_GM479516143.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-spins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-fun-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/como-hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/how-to-get-free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-free-link-facebook_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/mcpe-master-coins-hack-download_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-daily-free-rewards_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/20210-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/is-roblox-free-on-xbox_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_off00004955.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4955 24316 bytes
SHA-256: 0a61a4570cd7ac9d6aba8e936ade9ead518b2f79e9e768a9bc6a5708800c6846
font_01_sfnt_off0000805a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x805A 17884 bytes
SHA-256: 23dcadeb48e0d526df43250cfc669ee55e9a856b7439bddbcf6542ec0d6b5e03

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