Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac46526630f98499…

MALICIOUS

PDF

44.4 KB Created: 2020-08-31 07:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e02f1ec9a3c4a1c6fd8c02fa9d0acc72 SHA-1: 762f86277e9491ffc8b31cde9b6b87fc314f03ad SHA-256: ac46526630f98499f669e2658833216faba476ff6132cc1a1a3c779ccd4ed4c8
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users to malicious content. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL and a list of other URLs, likely part of a link farm to improve SEO for malicious content. The primary attack vector appears to be social engineering via a deceptive link within the PDF.

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.com/wix?keyword=czarina+russell+biograf%25C3%25ADa
    • https://static.usrfiles.com/ugd/930050_c2994e36651344b699b2b1dbe21273c9.pdf
    • https://static.usrfiles.com/ugd/fe83c3_10fafd5747db4e94ac1cda8d7cd4cb01.pdf
    • https://static.usrfiles.com/ugd/1fa6dd_e8c0c3167c2244a9808019a01de5312e.pdf
    • https://static.usrfiles.com/ugd/ac72e0_443ea644355146b2b71c0d2d8df4321a.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_cc4eebad0155407c8507aa1aa7c3de26.pdf
    • https://cdn.shopify.com/s/files/1/0432/2033/6802/files/piximanumajijujatadu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5744/files/zukeradak.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/12192676928.pdf
    • https://cdn.shopify.com/s/files/1/0431/7973/7237/files/9969046586.pdf
    • https://cdn.shopify.com/s/files/1/0433/2853/6726/files/90081607763.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d075c833b8c441498b884f0f9adf0fa.pdf
    • https://static.usrfiles.com/ugd/2f8cea_27f4d1a63d0f442f823370c0ff354933.pdf
    • https://static.usrfiles.com/ugd/9219f8_4093a0ef29fd46df8db52a16de80f6f4.pdf
    • https://static.usrfiles.com/ugd/e4a001_35090f44ec094a3db158cf1a0a0a7a41.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6f84af0b08f4bcdb4f3f152bb374db5.pdf
    • https://static.usrfiles.com/ugd/b8c837_5cb0d87d43b643459f4b7d9c3d301034.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_off00006181.bin
59d987c28576057673d25f6ef26f3fcca5e4b669d3dff9a34a04e796aa94cf05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6181 5004 bytes
font_01_sfnt_off00007293.bin
7690f79d0668bf7cc7ba40282fa4dda8bc39fc30ca6f6b3a5c9c98f33070fb22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7293 10080 bytes
font_02_sfnt_off00009523.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9523 4324 bytes

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