Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ba7090aca1a7eb…

MALICIOUS

PDF

36.0 KB Created: 2021-06-29 13:49:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c301c1b7623ca0b24dbe1e945481c363 SHA-1: 6fb5e42dcc58c31a73c0a822fe6870aa2ec28583 SHA-256: e7ba7090aca1a7eb953120e40344b3844b220fefd1bfa446af75bd238405257d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which are structured as SEO-optimized links to other PDF files, suggesting a link farm designed to drive traffic. The document body and extracted URLs indicate a lure related to game hacks and cheats, such as for Roblox and Minecraft. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links supports a malicious intent to redirect users to potentially harmful content.

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.co/app/431946152/dankmemes-v2-roblox-hack-game-hack PDF link annotation
    • http://kumotor.com.tw/upload/userfiles/files/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/what-is-the-cheat-t-get-robux_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-minecraft-mods-for-pc_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-free-robux-working-2021_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/oprewards-robux_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/app-store-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-spins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/wurst-client-112-2_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-2021-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/wizard-hacks_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/assassin-roblox-free-exotic_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/get-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off0000377d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x377D 21640 bytes
SHA-256: 0483fcf0f61ccf89ae43069e349704eb22b1753d1259b6d2dcbde6170154626a
font_01_sfnt_off000066ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66EA 19344 bytes
SHA-256: acc379e853a05d972987fea3f32418bea58c31fecf007d36d29fd94ba2bb5523

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