Malicious PDF — malware analysis report

Static analysis result for SHA-256 5758f763b91655ae…

MALICIOUS

PDF

36.0 KB Created: 2020-09-10 00:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d0d631f57ccd51a855af61df3568170 SHA-1: 1374b4afe81ba25a0ea1cc091d2c4328393b95cf SHA-256: 5758f763b91655ae51e8078a3612cd57c0db7ff61930e3910886be3fca7da7f0
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One critical heuristic identified a link to a known malicious redirector at ttraff.me. The document body, though heavily obfuscated, contains the same malicious URL, suggesting the primary intent is to redirect the user to a malicious site.

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.me/wix?keyword=possessive+adjectives+exercises+advanced+pdf
    • https://static.usrfiles.com/ugd/edb4a7_f34d4e3114bb4eee82993f7c808d2d2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_efae3432b1644de8aedfe7410be1d3af.pdf
    • https://static.usrfiles.com/ugd/2ca09c_6a95a6a59f9e4a07bfc99ca248c9878c.pdf
    • https://static.usrfiles.com/ugd/22bf55_116c6d55096443db91a186d178604d4a.pdf
    • https://static.usrfiles.com/ugd/834936_b8f685bdf233404a992e76f51fbdd4c6.pdf
    • https://static.usrfiles.com/ugd/ceb2e8_681db5ca05e54b3f83451a3a34579aad.pdf
    • https://static.usrfiles.com/ugd/ace02d_c27730ecd57e43d9bc3235174ac180c4.pdf
    • https://static.usrfiles.com/ugd/3d7af5_85528d85a03e41ce8869a50aa33ec218.pdf
    • https://static.usrfiles.com/ugd/b27199_5cf60ccda1da4238a0fe28d1d1c85d5e.pdf
    • https://static.usrfiles.com/ugd/bca722_5fbf1647b55c4a52a321d9c91bf11130.pdf
    • https://static.usrfiles.com/ugd/90661f_419ace8d7df640acba497f3731b7fafa.pdf
    • https://static.usrfiles.com/ugd/29c71c_aa07623511b94590973ec6bf7f1ed338.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/47199848115.pdf
    • https://cdn.shopify.com/s/files/1/0431/0836/8545/files/zifasegosidokanukapirigo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6559/7342/files/zewobodanis.pdf
    • https://cdn.shopify.com/s/files/1/0435/3271/4139/files/mufuwoxavonupejamif.pdf
    • https://cdn.shopify.com/s/files/1/0434/6124/7129/files/ffxiv_blacksmith_guide.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_off00004e2c.bin
75f5353591f3e87edce4bdeaace4828f27232024ea3430be1e246c33f7c9e26c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E2C 5324 bytes
font_01_sfnt_off0000606d.bin
b683d052014c53bab2d782da303cea7236386d368e23bb4250c4e7d322ca3840		 pdf-font-stream PDF embedded font (sfnt) at offset 0x606D 10068 bytes

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