Malicious PDF — malware analysis report

Static analysis result for SHA-256 52325416a91aa11d…

MALICIOUS

PDF

35.0 KB Created: 2021-07-06 06:29:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c46eeae9748587bdae20bf9ddc97324a SHA-1: 527b76654256cfc413b8f8039c9234f723397c62 SHA-256: 52325416a91aa11d6be2da640296fb75c1dd5b82d60a093de8369fd59f55c0d2
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to redirector domains, including one specifically identified as a malicious redirector. The primary lure appears to be related to 'free Robux' or game hacks, directing users to 'netcdn.tw'. The document body and heuristics indicate a link farm designed to drive traffic to these potentially malicious sites, likely for phishing or malware distribution.

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/431946152/rbxoffers-com-free-robux-game-hack In PDF document text
    • http://library.unissula.ac.id/fe/repository/minecraft-tower-defense-hacked_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/pubg-uc-kaise-kamaye_GM1330123889.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-free-spin-now_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/roblox-redeem_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/tik-tok-free-fire-kreatif-lucu_GM835599320.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/auto-clicker-for-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/works-how-to-get-free-robux-2021-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/roblox-lovenet_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/boku-no-roblox-stats-hack_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-robux-no-verifying_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-rainbow-wings-free_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-hack-apk-download-for-android_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/roblox-robux_GM431946152.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
font_00_sfnt_off000032aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32AA 22188 bytes
SHA-256: c90a2bcea0c9440864b3ffe244b4006b0db0057584cd667579fe782457df5b1c
font_01_sfnt_off000063e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E8 18976 bytes
SHA-256: a0223b82be68661a8b22d1b4f0340e8af90fd6b3faac36c3bfc3d0e3dd614ada

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