Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af77e58f2069b40…

MALICIOUS

PDF

48.7 KB Created: 2021-05-13 22:17:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-06
MD5: cb98e382bff44dc0e60b01978adb079f SHA-1: 185e71d63ab258e248a7b6607b18af1df76e1677 SHA-256: 4af77e58f2069b40ecabb3ae194234cb198e66dd532b1a4921704a8a4411b795
220 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9228

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/431946152/how-can-u-get-free-robux-game-hack In PDF document text
    • http://foo.com.tw/files/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-hack-online_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-hack-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/robux-now_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/whats-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-spins-coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-mod-apk-unlimited-spin-download-free-full-version_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ce1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CE1 29132 bytes
SHA-256: 7b5cbcfc4dd6a44f18ebb83b0e5d5a781b454db471f8748ed2fa86ccf177ea40
font_01_sfnt_off00008dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC0 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AD2 18696 bytes
SHA-256: 6d387a6157482ae5d4424ea2a1b018d5f079fe6dbc45eeb2149446a5bd008250

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