Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce85be468bd0bcb0…

MALICIOUS

PDF

44.5 KB Created: 2021-06-04 04:32:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d484ac17def99fd8459c844dbaa0f8f9 SHA-1: a6658f0cb836b974d5a41938d733e4596011e995 SHA-256: ce85be468bd0bcb0e0e1f80c9844557035b2641199044d54efbbc4fd9e333cb2
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to websites that appear to be part of a link farm, designed to lure users with promises of free game items and generators. One prominent URL, 'https://netcdn.online/app/406889139/coin-master-free-spins-no-human-verification-game-hack', is flagged as a malicious redirector. The document body and heuristics indicate a scam workflow, likely intended to drive traffic to malicious or ad-heavy sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coin-master-free-spins-no-human-verification-game-hack In PDF document text
    • http://library.futureuniversity.com/repository/all-free-skins-on-roblox-for-2021_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-spin-online-tool-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-master_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-unlimited-spin-apk-free-download_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-attack_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/spin-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/minecraft-modded-client_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/omplete-surveys-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-hack-coin-master-computer_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-hack-for-ios_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-spins-coins_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_004_off00005324.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5324 25112 bytes
SHA-256: 10a5a94686282076654ab4d843c8b90fd5a5303d8cf66fc363d9fb929967cb52
font_01_sfnt_off00008aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AEC 18420 bytes
SHA-256: bda9d64311803d8ca1e60170c3ec5fa1333a71d10f10bc88962b6478ba2902e6

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