Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8bb4221175f9ea…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 22:49:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d60a3c00f2a12befbc6276c0ead69948 SHA-1: 4b01d3af40b62f97336d5dc1a0f997ab54f8b014 SHA-256: ba8bb4221175f9ea12274f075eb917b67291479b7f696c4a14c80f078ab0200e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, employing a 'free generator / game hack' theme to entice users to click on links. The embedded links lead to a redirector and a large number of other PDF files, suggesting a link farm or SEO manipulation tactic to drive traffic. No scripts were extracted, but the PDF structure itself facilitates the redirection, aligning with common social engineering tactics.

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/406889139/free-spins-for-coin-master-game-game-hack In PDF document text
    • http://astdubai.co/userfiles/files/coin-master-hack-online-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/www-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/code-free-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/paginas-de-hack-para-roblox_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/robux-free-c_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/hacker-pro-roblox_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-luxury-car-greenville-roblox_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-adopt-me-free-pets_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_off000032ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32AE 22592 bytes
SHA-256: 4ad984ebd016a427e4f6e38caee6323b7bcb13c0962275fcaf68b61d325eb644
font_01_sfnt_off00006529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6529 18432 bytes
SHA-256: ba2b1c803cf60430fecd3a4ea667911e0c566277fb0db9da711a2662cfde09a8

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