Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa86900b28342d2f…

MALICIOUS

PDF

43.9 KB Created: 2021-05-15 08:32:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-06
MD5: 7d603ec7e501f4eaaf0ff335dac8770b SHA-1: d38029fb5efa2ed0b99f6dc3199339d44763566f SHA-256: aa86900b28342d2fd361bfa8b8bcee825bd85eb1351de5de32deedbf8c50bf60
260 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/free-100-robux-game-hack.
  • 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-100-robux-game-hack In PDF document text
    • http://anisio.eti.br/ckfinder/userfiles/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://anisio.eti.br/ckfinder/userfiles/files/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://anisio.eti.br/ckfinder/userfiles/files/free-robux-script_GM431946152.pdfIn PDF document text
    • http://anisio.eti.br/ckfinder/userfiles/files/mcpe-master-hack-unlimited-coins-apk_GM406889139.pdfIn PDF document text
    • http://anisio.eti.br/ckfinder/userfiles/files/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://anisio.eti.br/ckfinder/userfiles/files/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • http://anisio.eti.br/ckfinder/userfiles/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://anisio.eti.br/ckfinder/userfiles/files/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • http://anisio.eti.br/ckfinder/userfiles/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://anisio.eti.br/ckfinder/userfiles/files/can-you-really-hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://anisio.eti.br/ckfinder/userfiles/files/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://anisio.eti.br/ckfinder/userfiles/files/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://anisio.eti.br/ckfinder/userfiles/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://anisio.eti.br/ckfinder/userfiles/files/how-many-levels-in-coin-master_GM406889139.pdfIn PDF document text
    • http://anisio.eti.br/ckfinder/userfiles/files/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
    • http://anisio.eti.br/ckfinder/userfiles/files/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • http://anisio.eti.br/ckfinder/userfiles/files/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://anisio.eti.br/ckfinder/userfiles/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://anisio.eti.br/ckfinder/userfiles/files/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://anisio.eti.br/ckfinder/userfiles/files/how-to-create-group-in-coin-master-free-spins_GM406889139.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_off00004d23.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D23 26264 bytes
SHA-256: 1af15ab8e0d206068de3ceef766f1efe6ac23c21b3a7f3b856f55a7f833940c4
font_01_sfnt_off00008945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8945 18292 bytes
SHA-256: ade71c57547996cc2793a44f7be3e933a3a5664d4c8f362da863e6c031d51f12

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