Malicious PDF — malware analysis report

Static analysis result for SHA-256 191f640dfaae37c0…

MALICIOUS

PDF

43.3 KB Created: 2021-05-12 13:21:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-22
MD5: 81652bf6108dccab7bb39b8b385503af SHA-1: 961a090d6931642dd6287cd042d398f7cd143af4 SHA-256: 191f640dfaae37c0fc072452b8bebb75446416cd976814e161c5707cb689aa83
160 Risk Score

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/406889139/coin-master-free-spins-no-human-verification-game-hack In PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/level-coin_GM406889139.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/get-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/wurst-112-2_GM479516143.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/free-coins-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/minecraft-free-demo_GM479516143.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/coin-master-hack-apk-ios-download_GM406889139.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/free-minecraft-skins-pe_GM479516143.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/how-to-get-free-robux_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_off00004deb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DEB 24936 bytes
SHA-256: 597d3a07889508d9b2c41bca8e19e535173803185debbd6aef6a39830321f6f4
font_01_sfnt_off000086b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86B8 18420 bytes
SHA-256: bda9d64311803d8ca1e60170c3ec5fa1333a71d10f10bc88962b6478ba2902e6

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