Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4d4f32d1e5fddc…

MALICIOUS

PDF

42.9 KB Created: 2020-09-02 04:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 142c90e4d1f4cbafde65fa16cc5d34e8 SHA-1: a7dcaf195c0e3cd488634f9414f12ac45c5820cf SHA-256: 3f4d4f32d1e5fddc1caf7e02043fc61733a0c5aefd8c8ae34a0b8ea383b3b4eb
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, a technique often used for SEO poisoning or to obscure malicious redirectors. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm. No scripts were extracted, but the overall structure suggests an attempt to lure users to malicious 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.club/pify?keyword=liderazgo+transformacional+ejemplos+famosos In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_439cb3377941494f903a4dad124ae329.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b916f4_9d672bc4ed0441d8b7bb224b42444b84.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_d94b033543fd4ea18abc292643af1d68.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/269bb8_5374f58d70db4546b291cde83779fd2c.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3962/9218/files/81433569110.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8940/2779/files/mezanivorepivakudavekumij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2177/0657/files/chesterfield_mi_weather_report.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/87d215_adf7ee9f623e43909f7b70547e658ec0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/60933b_02a84f536aa14ed89cbeb5779608c4a3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/97493d_d7381d3bd42c4964bb35f8d16d2912a8.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67C2 5544 bytes
SHA-256: bf6464e18461efdc1359b217df1835b707ae2d29cc385d193a1bffb92576ad92
font_01_sfnt_off00007a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A9E 11176 bytes
SHA-256: be5b37f36053f641fc18fbea653461f18ce83dadf46c5153c9d99a82c4891fa3

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