Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d1e0b5813dc6cd…

MALICIOUS

PDF

53.2 KB Created: 2020-08-28 23:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6546887821f72b6f3162750499f89ca5 SHA-1: dc5d2c45ef8f7185faac0220a87a9d86a1df430c SHA-256: e5d1e0b5813dc6cdb258cef950c468b94f845fc5bf9d9a5204f468421d926425
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to the redirector. The presence of numerous external PDF links suggests a link farm or SEO poisoning tactic to distribute malicious content. The primary attack vector appears to be social engineering through deceptive links within the PDF.

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=aprendizajes+esperados+tercer+grado
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jonamov.pdf
    • https://cdn.shopify.com/s/files/1/0432/9937/3214/files/81888465129.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/12671306122.pdf
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/campbell_biology_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/3020/0991/files/aaqa_ka_milad_aaya_naat.pdf
    • https://cdn.shopify.com/s/files/1/0461/9200/1175/files/93595408112.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/ejemplo_de_factibilidad_financiera.pdf
    • https://cdn.shopify.com/s/files/1/0432/2823/3885/files/relut.pdf
    • https://cdn.shopify.com/s/files/1/0431/8055/6452/files/tususakoledowutixugozo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0235/6127/files/ruscus_aculeatus.pdf
    • https://cdn.shopify.com/s/files/1/0431/6430/3516/files/6872904583.pdf
    • https://static.usrfiles.com/ugd/b8c837_03b79bbc41cb40b0a2e6c983721a8b59.pdf
    • https://static.usrfiles.com/ugd/b8c837_e847a8f80fd549a3a5b5a5386cd21c87.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_off000080ef.bin
4679689741ffbe615393a658dca0426fd93ac4b9e7a12962531e98312b29aabb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80EF 5112 bytes
font_01_sfnt_off00009262.bin
563bd285c4d2d62dd717170906074ce063da09d5a12e642d21e6290e266435df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9262 11800 bytes
font_02_sfnt_off0000b7f9.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F9 4324 bytes

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