Malicious PDF — malware analysis report

Static analysis result for SHA-256 86657e817a276403…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 16:46:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4b483fccd103120c34bad92e6abd0b6e SHA-1: ecf968440c34a9f0f872fc86b82e1d55bc2c15e4 SHA-256: 86657e817a27640385caa571b101639681f699972136805c3e53eee0eb8678fb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to a redirector hosted on 'netcdn.tw', disguised as a generator for game hacks and currency. The ML classifier and specific PDF heuristics strongly indicate malicious intent. The embedded URL is designed to trick users into downloading or visiting a malicious resource, likely leading to further compromise.

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/431946152/free-robot-animation-roblox-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/cheats-coin-master-free-spins-and-news_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-unlimited-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-gamepass-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-hack-someones-roblox-using-a-link_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/fbchampion_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-robux-hack-tool-no-download_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-hack-scripts-2021-powerplay_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-free-obc-v3rm_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/game-for-have-a-robux-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-50-tiktok-views_GM835599320.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-daily-free-spins-link-app_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
font_00_sfnt_off00003030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3030 22292 bytes
SHA-256: 3593be362378369cbe314c0db11a17c898da84422a247c2dc80f51327aa48c70
font_01_sfnt_off000061c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C3 19132 bytes
SHA-256: 2fea74052c9004b087fe60b544b7a46eb1cd6b2c633551838b874fd2df48ee7c

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