Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6c74e9c707f3f3…

MALICIOUS

PDF

88.3 KB Created: 2020-08-30 10:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86a2e0ca29b7d0aaab1bdf200a69d1d0 SHA-1: f0709ba2330ef8771dbeac74296d872b1a60c45e SHA-256: 5a6c74e9c707f3f3f65d591624d035d17e0dd1d8d33739fddb9506c5fa3094c7
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=base+y+dimensi%25C3%25B3n+de+un+espacio+vecto'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many of which are to benign PDF files hosted on static.usrfiles.com. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to external 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.ru/wix?keyword=base+y+dimensi%25C3%25B3n+de+un+espacio+vecto
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_809096bc45d647aabe6144a7a1001dca.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc2ca64bcc87477fb5d65930b045d250.pdf
    • https://static.usrfiles.com/ugd/a467d2_9238d086788741adb33b17c6c06b00c6.pdf
    • https://cdn.shopify.com/s/files/1/0435/9772/5864/files/mezimologomikuwij.pdf
    • https://static.usrfiles.com/ugd/2b25b5_5770584ec4b342e997367e23c70f9e4a.pdf
    • https://static.usrfiles.com/ugd/d99ef3_1cd4999679764da79e1be0b5274ff9c0.pdf
    • https://static.usrfiles.com/ugd/10b11f_c24b4785130f49a4a9d4ff5ee12ca5b6.pdf
    • https://static.usrfiles.com/ugd/f8de3e_d2c4ba7064d04f7486232dc8ea2d1f47.pdf
    • https://static.usrfiles.com/ugd/b8c837_a3fad402974c48eda4ff995286b5a2a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa3f1faec73e480c94bc9a41c8222df8.pdf
    • https://static.usrfiles.com/ugd/b8c837_80314a30d10c4facaac57f5f2912e18e.pdf
    • https://static.usrfiles.com/ugd/b8c837_311dbce3144d43c98b3106dcf7d0116c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd60.bin
61de07a4f8d9f8ca689dfb4e8c3556f216b4dd5f15b600e4b65b7277603353af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD60 5320 bytes
font_01_sfnt_off00010f2c.bin
a329dd6489d11ccb4519ec90ca20e038bdfe1633d9761d514a81cc21f9d3a7fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2C 17580 bytes
font_02_sfnt_off0001444f.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1444F 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.