Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8e73c60d54eadf…

MALICIOUS

PDF

31.7 KB Created: 2020-08-30 05:40:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 034f750d55cdccfda6217ed43b15aa6a SHA-1: b7221f370027203ffc660ddbcda7da8633636e51 SHA-256: 4e8e73c60d54eadf2b7a1e308b81fafbd0bced74235e4ebba4bd043766c391ed
150 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple embedded URLs, including one pointing to a known malicious redirector. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms this. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for 'mixed tenses exercises advanced pdf'. The ML classifier also strongly indicated maliciousness.

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.ru/wix?keyword=mixed+tenses+exercises+advanced+pdf
    • https://cdn.shopify.com/s/files/1/0430/7265/1413/files/21311494928.pdf
    • https://cdn.shopify.com/s/files/1/0433/5822/4549/files/dunivonufanububabixuju.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/27508451916.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/27585163053.pdf
    • https://cdn.shopify.com/s/files/1/0431/4244/7261/files/paxefugew.pdf
    • https://cdn.shopify.com/s/files/1/0433/8538/9221/files/viber_apk_mod.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2557/files/bubble_sort_in_mips.pdf
    • https://cdn.shopify.com/s/files/1/0434/9542/4165/files/buku_agama_islam_kelas_8.pdf
    • https://static.usrfiles.com/ugd/d2cc1f_d49a4141a62a423e961588f5380eb87c.pdf
    • https://static.usrfiles.com/ugd/5b9365_a5fd171dfa4b4c4282560a918c7004d2.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_off00003f1d.bin
38df73a4713b566c181d8f2151ce125e9a1edefa3abea27ed1e6a85508d137a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3F1D 5248 bytes
font_01_sfnt_off00005113.bin
4cbb6da536462b4d007feca3585e66b5292c4d1f680302cd52c21a8a864574fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5113 9760 bytes

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