Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8c842b45f70c49…

MALICIOUS

PDF

42.0 KB Created: 2021-05-16 01:45:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-06
MD5: 2bf531793bc70480654e83ef77c0add3 SHA-1: 9d7050cee72da6f9735e109c48c3c53aa2309f2b SHA-256: aa8c842b45f70c49b3adb6fc9cddbfc8033853ed32d7f27a8ba4a45ebadbace0
260 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/getrobux-ninja-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/getrobux-ninja-game-hack In PDF document text
    • https://jinghuaeye.com.tw/upload/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://jinghuaeye.com.tw/upload/files/coin-master-free-snacks-link_GM406889139.pdfIn PDF document text
    • https://jinghuaeye.com.tw/upload/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://jinghuaeye.com.tw/upload/files/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://jinghuaeye.com.tw/upload/files/collect-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://jinghuaeye.com.tw/upload/files/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • https://jinghuaeye.com.tw/upload/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://jinghuaeye.com.tw/upload/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://jinghuaeye.com.tw/upload/files/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdfIn PDF document text
    • https://jinghuaeye.com.tw/upload/files/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • https://jinghuaeye.com.tw/upload/files/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • https://jinghuaeye.com.tw/upload/files/coin-master-unlimited-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://jinghuaeye.com.tw/upload/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://jinghuaeye.com.tw/upload/files/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • https://jinghuaeye.com.tw/upload/files/coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://jinghuaeye.com.tw/upload/files/coin-master-hack-no-verification-ios_GM406889139.pdfIn PDF document text
    • https://jinghuaeye.com.tw/upload/files/coin-master-hack-game-download-mod-apk_GM406889139.pdfIn PDF document text
    • https://jinghuaeye.com.tw/upload/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://jinghuaeye.com.tw/upload/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://jinghuaeye.com.tw/upload/files/coin-master-free-coins-and-spins-daily-summary_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_off000048f9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48F9 24576 bytes
SHA-256: a33e200df508b48ff13044dd7d7a8740dd0b4a388f9213311f03c7e1da72eb4e
font_01_sfnt_off000080e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80E1 18492 bytes
SHA-256: d23b7c5832d9f3375e6d59d692932375930e92cba448a5500249390e72a71ae2

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