Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ca4d9c3394311c…

MALICIOUS

PDF

46.3 KB Created: 2020-08-30 23:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87fa670f5b69904fca4e1d754f16eeab SHA-1: 021dc57760fab898b8010548a34ad57568653088 SHA-256: 23ca4d9c3394311ce5a347b57ed04c0dc94aef85201f2e361d01704aa446c653
120 Risk Score

Malware Insights

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

The PDF contains a link farm designed to lure users with terms like 'nursing textbooks online'. The primary link, https://ttraff.cc/wix?keyword=nursing+textbooks+online, is identified as a malicious redirector. This suggests the document's purpose is to redirect users to malicious content or phishing sites under the guise of providing educational resources.

Heuristics 3

  • 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.
  • 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.cc/wix?keyword=nursing+textbooks+online
    • https://cdn.shopify.com/s/files/1/0439/7996/4574/files/vuteb.pdf
    • https://cdn.shopify.com/s/files/1/0430/9372/1255/files/wufonuzuxemotefekujizile.pdf
    • https://cdn.shopify.com/s/files/1/0434/8392/2585/files/the_boyfriend_list.pdf
    • https://cdn.shopify.com/s/files/1/0435/6620/3029/files/madutifirelu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9307/2808/files/is_dashlane_a_virus.pdf
    • https://cdn.shopify.com/s/files/1/0429/8555/4073/files/78220842899.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/46157695649.pdf
    • https://cdn.shopify.com/s/files/1/0431/5388/3293/files/avg_free_antivirus_software_full_version.pdf
    • https://static.usrfiles.com/ugd/b8c837_204a331194f440838d8c927d2a2c01f9.pdf
    • https://static.usrfiles.com/ugd/9734e7_2c1879cfd79a47b48c7608bc0c08c07b.pdf
    • https://static.usrfiles.com/ugd/10b11f_6688515fa01542d6b4bc07775fd4802e.pdf
    • https://static.usrfiles.com/ugd/f80014_099930541aef4710b02e884c197a30c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_039835a708814282a1dc5d2e04d0ec66.pdf
    • https://static.usrfiles.com/ugd/b8c837_9543041731a9400ebdc99d0dbe95e7dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa89c02855b941628bacb9b8834f225e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000690d.bin
8c53dfa3460389e6cb576aa2532b37d2bb12179fd787d4bdbd5ebd22f4279a2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x690D 4768 bytes
font_01_sfnt_off00007954.bin
e5cb85e9d0a3ff1d6ce2fd39632ab8f24850538b44866ca06c7a2a3d25c6ea79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7954 10836 bytes
font_02_sfnt_off00009e1d.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E1D 4324 bytes

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