Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c95da096caffa0…

MALICIOUS

PDF

48.6 KB Created: 2020-08-05 17:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b2f373a5a312f0f4df4d4a434280d65 SHA-1: 02542f28d1cbacdfbc348c5fd6d28a664b354e8d SHA-256: 22c95da096caffa0103aba8b6de46cb0e63e329c1d9a392440bf6b96feb3c529
120 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as academic notes, but the primary link redirects to a known malicious redirector. The document body itself is heavily obfuscated and contains the malicious URL. The presence of numerous external links to PDF files hosted on various domains suggests a link farm for SEO poisoning or traffic generation, ultimately leading to malicious infrastructure.

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/pify?keyword=artificial+intelligence+and+expert+systems+notes+pdf
    • http://files.lesbiansinfleeces.com/uploads/1/3/2/6/132696171/xuxulikalagu_benuworoza.pdf
    • http://jedulega.shawnsaumell.com/uploads/1/3/0/7/130775735/222af.pdf
    • http://files.dontperish.com/uploads/1/3/0/7/130740012/vofudi.pdf
    • http://files.desertjade68.com/uploads/1/3/0/7/130739415/xodinat_razegirabovugo_mibug.pdf
    • https://cdn.shopify.com/s/files/1/0433/5704/4890/files/dogosidu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8991/1194/files/38918869212.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/53710453689.pdf
    • https://cdn.shopify.com/s/files/1/0435/3903/8360/files/xujiwukunuvaxabekenufofa.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3384/files/pudido.pdf
    • https://cdn.shopify.com/s/files/1/0431/9091/1137/files/essentials_of_corporate_finance_ross.pdf
    • https://cdn.shopify.com/s/files/1/0430/9683/4212/files/3725910487.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lekerumukin.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5410/files/fofuzinazusanu.pdf
    • https://cdn.shopify.com/s/files/1/0436/1984/4258/files/vopozan.pdf
    • https://cdn.shopify.com/s/files/1/0434/7081/5397/files/gigotijezakisirokup.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_off00007d49.bin
809ab72a24c0359ad60e1dfe2aaa566f68c3a6d914de1a51470d41c66029453e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D49 5636 bytes
font_01_sfnt_off00009072.bin
e13a6299bfe63aa695db392a92b57fa7a125c6099f0b754f0e661f474d9b6344		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9072 10764 bytes

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