Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eeab6f9ab15af7e…

MALICIOUS

PDF

44.2 KB Created: 2020-09-07 20:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c19240ede6a6028bf70d74b341889863 SHA-1: 28e1e75b9f0e0938172b185dadf835b37429eda7 SHA-256: 8eeab6f9ab15af7ecf209bc672da42f474eb138dc76f7fc24af5bb9502095be2
150 Risk Score

Malware Insights

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

The PDF file contains a malicious redirector link disguised as a gateway to test answers. The document body, though heavily obfuscated, contains the target URL and numerous other PDF links, many pointing to static.usrfiles.com. The primary malicious URL is https://ttraff.club/wix?keyword=gateway+b2+tests+answers+unit+5, which is likely used to redirect the user to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.club/wix?keyword=gateway+b2+tests+answers+unit+5
    • https://static.usrfiles.com/ugd/9374a7_c4a17bdcbde946fd9e916a39e13ca089.pdf
    • https://static.usrfiles.com/ugd/e4a001_704d05f99ef341e6805e39195776160d.pdf
    • https://static.usrfiles.com/ugd/55cc32_daaf37fba9fc48309c02efc1222924b6.pdf
    • https://cdn.shopify.com/s/files/1/0434/4558/4033/files/brunelleschi_s_dome.pdf
    • https://cdn.shopify.com/s/files/1/0436/4160/2198/files/ferabewumib.pdf
    • https://cdn.shopify.com/s/files/1/0429/4456/1319/files/57763585430.pdf
    • https://cdn.shopify.com/s/files/1/0430/5793/8581/files/kalivapirirawofesugan.pdf
    • https://static.usrfiles.com/ugd/8b4172_dfbacb378bfd4135ab95fc75c4bb997e.pdf
    • https://static.usrfiles.com/ugd/f63f29_8c0f1612e24347a19b207c7eda187abf.pdf
    • https://static.usrfiles.com/ugd/aa14a9_5f5044eb363c4a768ca03c733b2d4cad.pdf
    • https://static.usrfiles.com/ugd/68ec51_b9caacb924504ab39f3e38a10cb875cf.pdf
    • https://static.usrfiles.com/ugd/07ef24_1e7eb118f03d4b7d8b1051bdee88a8ff.pdf
    • https://static.usrfiles.com/ugd/6c032c_094b6ffab6b643d388c9c846d6d2502a.pdf
    • https://static.usrfiles.com/ugd/3d0627_c008453c7a86456c90628d2eef86bfe7.pdf
    • https://static.usrfiles.com/ugd/6e13d9_0aa1d99e39e448dfa1cfb48a5a9f7247.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_off00006ad0.bin
945c6a7bdb9b5f72979e75427b149c9bb0f96c029eeaeefd66a4187b04dc9d1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD0 5268 bytes
font_01_sfnt_off00007ceb.bin
bae0c07dc859abc098ade296a0919c68ae20e3999df096ca7c6fbc7c01e154db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CEB 11580 bytes

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