Malicious PDF — malware analysis report

Static analysis result for SHA-256 61343228de92600b…

MALICIOUS

PDF

54.6 KB Created: 2020-08-31 02:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a20c64ec24b75a2f822b03a0eebd8d41 SHA-1: c21ac97c21e78e03de3a7dd56daf1d383e1cdef2 SHA-256: 61343228de92600b903f1ae61776f60cb75b612b332c2506c05bdc9332480dc4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'allied race heritage armor'. The presence of numerous external PDF links, many pointing to benign content, suggests a link farm or SEO poisoning tactic to obscure the malicious redirector. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wix?keyword=allied+race+heritage+armor
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b7ab08_bf47ae76e7794a92891555983a108e67.pdf
    • https://static.usrfiles.com/ugd/b8c837_80b834759d2c4e9b943af6c63b8f4b64.pdf
    • https://static.usrfiles.com/ugd/b8c837_5fc6c97f93bc4691a976cd63338b8b70.pdf
    • https://static.usrfiles.com/ugd/b8c837_a245929504a444c6b1b6c2df20d37b56.pdf
    • https://static.usrfiles.com/ugd/b8c837_d266402472414158b460019f36a765e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_a3bb013c06c34e6aa3ca6e2b8b29ce4d.pdf
    • https://static.usrfiles.com/ugd/4b7290_a58baf23c75346a4bfcb2f3915c444de.pdf
    • https://static.usrfiles.com/ugd/764aaa_6dbc4cd0195c4f13b36f243d9744a683.pdf
    • https://static.usrfiles.com/ugd/b8c837_4cb3ad1242f04be28a2eabfdc0afa6fb.pdf
    • https://static.usrfiles.com/ugd/45e30f_63a903a70493453187318f47e7d7bf0f.pdf
    • https://static.usrfiles.com/ugd/7603ae_1b0552075c76448099c529eb4c2f4827.pdf
    • https://static.usrfiles.com/ugd/b52961_539ab6c7627e4814a510f71c4a65a62b.pdf
    • https://static.usrfiles.com/ugd/3649d2_86fbc12c0c9d4222af01932b0c5f7d48.pdf
    • https://static.usrfiles.com/ugd/cb2bed_2afd9b98de6f4c74b9b65d72acbb15b6.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009a95.bin
dd8349ea51bf8af8af8df157cd77ac71f67e7f9e1b19131613fc28a06e86f4d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A95 5164 bytes
font_01_sfnt_off0000abf3.bin
42ddb47c6fedefe6f9d5ca7feeb951fec0cc8539d75e44e115808b61c3f6d840		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABF3 9812 bytes

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