Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf233d821d129511…

MALICIOUS

PDF

41.8 KB Created: 2021-05-16 07:39:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7812593ad06a9d95ea892d0e156c23fb SHA-1: decaec80de7cf6023ca9b784e206d7e5f26046bd SHA-256: bf233d821d1295118411648b475d9b95fd610b6dfbcdcef9da9f113afa21d951
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, disguised as a 'free generator / game hack'. The document body, though heavily obfuscated, contains URLs that further support the redirection and lure theme. The presence of embedded URLs and the ML classifier strongly indicate malicious intent, likely to lead the user to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/freespinandcoin-game-hack In PDF document text
    • http://gavertrimmers.be/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://gavertrimmers.be/images/ear-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://gavertrimmers.be/images/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://gavertrimmers.be/images/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://gavertrimmers.be/images/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • http://gavertrimmers.be/images/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://gavertrimmers.be/images/roblox-2021_GM431946152.pdfIn PDF document text
    • http://gavertrimmers.be/images/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://gavertrimmers.be/images/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://gavertrimmers.be/images/minecraft-free-ios-no-verification_GM479516143.pdfIn PDF document text
    • http://gavertrimmers.be/images/free-coin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://gavertrimmers.be/images/wurst-client-112-2_GM479516143.pdfIn PDF document text
    • http://gavertrimmers.be/images/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://gavertrimmers.be/images/coin-master-hack-without-downloading-apps_GM406889139.pdfIn PDF document text
    • http://gavertrimmers.be/images/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://gavertrimmers.be/images/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://gavertrimmers.be/images/best-tricks-co-robux_GM431946152.pdfIn PDF document text
    • http://gavertrimmers.be/images/free-robux-games_GM431946152.pdfIn PDF document text
    • http://gavertrimmers.be/images/coin-master-hack-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://gavertrimmers.be/images/minecraft-java-hacks_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
stream_003_off00004893.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4893 25392 bytes
SHA-256: 39600e57a27433f1475cd21bc7e6d6fdce72d2e8c771b19112d05e6ea7d40fe8
font_01_sfnt_off0000820a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x820A 17956 bytes
SHA-256: 1c693cd3c749c7deb88a93ce437f6f23953c7e7e8560ccdde2498ee9463f8dc4

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