Malicious PDF — malware analysis report

Static analysis result for SHA-256 4146523a9ee4515a…

MALICIOUS

PDF

49.5 KB Created: 2020-08-29 21:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32f47589789de8268ed3a746da3c0331 SHA-1: 61c33810914ddffd4d2ff29cb20a1c0a92632af0 SHA-256: 4146523a9ee4515a1eb91b6773146501a4676634c45c67c27048283578b5501d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=frequency+in+spanish', which is likely part of a phishing or malware distribution scheme. The presence of numerous external PDF links further supports the attack pattern of directing users to potentially harmful content.

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=frequency+in+spanish
    • https://static.usrfiles.com/ugd/3aca14_70cf37d1892043bebd9e898930578fa1.pdf
    • https://static.usrfiles.com/ugd/b8c837_463de93d2f4c4289be6300a96b299f5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_258c5ebfe2f44e61ae08dfc4b160009d.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ae98099124d4e1a86b3c9530ce728b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_82ffa41a2f0a4ea58ef08650f38e5c37.pdf
    • https://static.usrfiles.com/ugd/b8c837_f567e457d5834630a72c88a801cf185e.pdf
    • https://static.usrfiles.com/ugd/b8c837_2b3463456e4549edbdb81a62087af4a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0e9143163c9454885a7afaced1de5c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_b54a9d3abc9d49a990bfec7a8d823e08.pdf
    • https://static.usrfiles.com/ugd/d2751c_167e2a27179a4c08803df4a1653623d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1c55af24b0a4521af701ff3025378bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3eeb3ced771494d89cdb5f217548af8.pdf
    • https://static.usrfiles.com/ugd/ce14f3_a803313fc7964487a39cda9adba19aee.pdf
    • https://cdn.shopify.com/s/files/1/0433/9515/4070/files/reporting_anova_assumptions_apa.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/budomu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1384/8731/files/basusuxoxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3335/3627/files/20325423231.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/58344096598.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_off00007c08.bin
bbd6b03694995d76f8f9ca63b6559e1bcf70789827ec9ad480176d53cf896f92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C08 5172 bytes
font_01_sfnt_off00008da7.bin
e4d0aa38ae208b349d450769c13b3e13204a8c937794aac2876345ce03484826		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA7 13960 bytes

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