Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6bc209f935f7d8…

MALICIOUS

PDF

46.4 KB Created: 2020-08-31 09:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9255fa00f21142bec90b700ac27131a3 SHA-1: 974fd30df642be0d53a179c8ee13b6c635a99e0b SHA-256: ab6bc209f935f7d8ac551cc5c1720dade918c8f201ba7ba0f210757a912c28e9
128 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a malicious payload. The document body also contains a call-to-action phrase, suggesting a lure to trick the user into clicking the link. The presence of numerous other PDF links, many pointing to static.usrfiles.com, indicates a link farm strategy, likely for SEO poisoning or to obscure the final destination.

Heuristics 4

  • 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 https://ttraff.ru/wix?keyword=top+notch+2b+workbook+answers
    • https://static.usrfiles.com/ugd/b8c837_c4815c83b5ea43cca81076e6b930a981.pdf
    • https://static.usrfiles.com/ugd/b8c837_d11437a55e144f4ba2404a42807a9aa8.pdf
    • https://static.usrfiles.com/ugd/3e9e83_a5ae50cafeb34330864959c4ca675899.pdf
    • https://static.usrfiles.com/ugd/fb5067_61c3a8f68ac440ab9a16e59c025b1d57.pdf
    • https://static.usrfiles.com/ugd/09273f_2e3b42eda73544899e9157a8e9db4d09.pdf
    • https://static.usrfiles.com/ugd/217d68_4671402dd3154e4297b7c344a6df3d6f.pdf
    • https://static.usrfiles.com/ugd/4ae4db_a6f5618cfc5c4889ad11eeb370766c63.pdf
    • https://static.usrfiles.com/ugd/cac9e4_faed27b61432473b99f4629233c5fdf6.pdf
    • https://static.usrfiles.com/ugd/23e9be_48e90d5afd99475d969b2c327e02adf8.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae87d4803963406e8ddc21f43e6480d0.pdf
    • https://static.usrfiles.com/ugd/e3834b_5f105ddf065446b6b16f2c1c115f4ebe.pdf
    • https://static.usrfiles.com/ugd/1c90dc_13532e9c0e144d798f00769cc3cce2bb.pdf
    • https://static.usrfiles.com/ugd/d775a9_27880f0fb4d34e6a83bde89b9a429fc1.pdf
    • https://static.usrfiles.com/ugd/b58d21_56e7823c34164e099b62a5075d30cf4e.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e21.bin
ef0fd2627c8745bac0d351e47b48cbeae795f9cc83ffd818cdf91c71295fa964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E21 5368 bytes
font_01_sfnt_off00008062.bin
a0b85fd80deb6f1a95a052bac2654f5dfdbc5d8e371861d5ee957edd8504f3cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8062 14152 bytes

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