Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa87067a9e467de2…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 07:53:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-06
MD5: ff9ef9699e6d33b44721560db2757362 SHA-1: c9f66859e83d8958d0bc1b01ee37d081d52e7fdd SHA-256: aa87067a9e467de213640ec16ebeb8bedadecad29d0ae1d265ecafa9a97ee3d3
220 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-apk-mods-coin-master-game-hack In PDF document text
    • http://library.acehresearch.org/repository/how-the-fuck-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-robux-fast-and-easy-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/release-boku-no-roblox-remastered-free-lvl_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-no-offers-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-free-robux-hack-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-gift-card-roblox-codes-2021-list_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-hack-game-tool_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-real_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-with-synapse_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-generator-no-ads-or-surveys_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-points_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-roblox-gift-card-giveaway_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/are-tiktok-free-views-hack_GM835599320.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-link-blogspot_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_002_off00002f68.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F68 22908 bytes
SHA-256: 12e826e87ccc7045bea158caa8a7c4f204c9bd1f4192bf73c4880eccee69492b
font_01_sfnt_off00006261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6261 18520 bytes
SHA-256: 1398884dac2028e061369115e8a3b7a32d2536430df951e4127fe5fc2f51c071

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