Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66c70784dec7568…

MALICIOUS

PDF

34.8 KB Created: 2021-07-06 05:48:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b9c881860b107c0d870c8111e8854bc4 SHA-1: b01a572c0714805695514ffb56adb48482c6635e SHA-256: e66c70784dec7568d4e325666d00bd2e167946e81f264b2b3d11ef4455f5fc68
182 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. It uses a password-protected-archive lure. 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 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/431946152/how-to-hack-peoples-roblox-accounts-game-hack PDF link annotation
    • http://library.atim.ac.id/repository/roblox-apk-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-elemental-dragon-tycoon-cheat-codes_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-generator-no-surveys-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-cheats-to-get-into-robux-game_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-free-robux-ad-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-lua-course-free_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/descargar-roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-cool-free-skins_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/hacks-for-roblox-giant-simulator_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-hack-someone-on-roblox-without-password_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-jailbreak-hack-client-download-trackid-sp006-trackid-sp006_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/cheat-to-win-obby-roblox-yt_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/download-hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-install-minecraft-for-free_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
font_00_sfnt_off00003040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3040 22300 bytes
SHA-256: ae46e98f3ccfb5ca38c363973f0342e7c3a19f16d213b1e4bee77b9b4b039659
font_01_sfnt_off000061a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A7 19392 bytes
SHA-256: 455054d53819942057d20be51cc97c11c8340df0e33a1662ffdae35838096838

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