Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbce0f72da8bc42…

MALICIOUS

PDF

35.6 KB Created: 2021-07-06 16:46:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 922370a55c56af46452a10625cc6a60d SHA-1: 15a814adb136b4ae11b63d7a5bc024bca5527927 SHA-256: 9dbce0f72da8bc4267211d4e6f40c95d50fa52e1bdaecea8eb082e24020e7455
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/479516143/minecraft-bedrock-edition-pc-download-free-game-hack PDF link annotation
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/redeem-your-free-robux-at-http-get-robux-eu5-net_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/how-to-bypass-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/this-group-gives-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/ban-script-hack-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/how-to-get-the-golden-tuxedo-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/roblox-shirt-maker-free-shipping_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/robux-hack-download-app_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/does-cheat-engine-work-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/lua-script-executor-roblox-free_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/100-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/op-rewards-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/free-roblox-scratch_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/how-to-hack-linkmon99-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/why-does-roblox-servers-shutdown-when-cheat-engine-is-on_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/candy-cheats-in-murder-mystery-2-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/free-faces-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/how-to-get-free-robux-2-15-2021_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_off0000348b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x348B 22392 bytes
SHA-256: 2729b8afaf7601640a2314097fdbd97c5a74fd6d6d3e79c46f8ed85756cc1e49
font_01_sfnt_off00006622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6622 19120 bytes
SHA-256: 18cb023a17afcf6f32a9a51320420adca51e0723189dec2cb2e77558246ce529

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