Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9df25ffe661f8c…

MALICIOUS

PDF

33.8 KB Created: 2021-07-09 01:16:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0fd042f115375ad0290ac37c911e7c6f SHA-1: e05fd6e7a0e7d3f213410f218a3b18bf8b295774 SHA-256: aa9df25ffe661f8cae4f5a04798f89bff3c749ead21dc381fb0ba6dcfa91fafd
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that link to external sites, many of which are related to game hacks and free in-game currency. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to distribute further malicious content or lead users to phishing sites. The document's content and structure indicate a lure for users seeking cheats or exploits for popular games.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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
  • 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/freerubux-game-hack PDF link annotation
    • http://kumotor.com.tw/upload/userfiles/files/roblox-com-free-play_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/btools-hack-for-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/pasos-para-hackear-coins-master_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-hack-a-group-on-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-free-robux-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/get-20210-robux-on-roblox-free_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/pubg-uc-via-login_GM1330123889.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-hack-september-2021_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/cheat-roblox-lumber-tycoon-2-axe_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/can-you-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/minecraft-pe-free_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/minecraft-the-complete-handbook-collection_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_off00002da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DA3 22676 bytes
SHA-256: 9fc2702fda247478dce47b53a87998b520ea9d8407d1b2e412a977805547810c
font_01_sfnt_off0000605b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x605B 18572 bytes
SHA-256: a4910544a3301e21d5425f47d387c0dcd2b1454e32e0c532c02705c370365377

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