Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98bf70c526c69bf…

MALICIOUS

PDF

36.1 KB Created: 2021-07-06 08:30:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6ba5462d0806850c79d85a17b31bff28 SHA-1: 1259e3b6bf21f6efeff84dfc1af4db7c2d88caa4 SHA-256: f98bf70c526c69bfd2152b7d4d9d118527068a12c7c27d3cd59dc1373d3bd992
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting "game hacks" and "free generators." The primary redirector URL identified is http://netcdn.tw/app/406889139/coin-master-hack-mod-apk-35-8-game-hack. This indicates a social engineering lure designed to trick users into visiting potentially harmful sites, likely to download malware or engage in other malicious activities. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/coin-master-hack-mod-apk-35-8-game-hack In PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-1-million-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-robux-generator_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/extreme-injector-roblox-hack_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-a-free-dominus-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-animals-from-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-roblox-hair-girl_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/minecraft-free-minecraft_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-make-a-roblox-dominus-for-free_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-robux-easy-hack-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-hack-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-sword-that-work-in-roblox-games_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-pe_GM479516143.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_off00003388.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3388 23396 bytes
SHA-256: 63eb6907afcd4af18b6e960a789455d32539adfeb34ebf53e56e6081ef81befb
font_01_sfnt_off0000685e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x685E 18872 bytes
SHA-256: f8f88724432d8d9f28d7b314fb7cacf118717b6639cfc779c614c4dfb23bb782

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