Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9e5365c1ede67f…

MALICIOUS

PDF

63.0 KB Created: 2020-09-01 02:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df23363c8dc4d4f4effb13a030974433 SHA-1: 41ea4ed3f7c564c660334aad4468a938a767e524 SHA-256: 5a9e5365c1ede67ffb87be7f3153aea08904642bacea3575176f88f595135310
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, characteristic of a link farm, with one URL identified as a known malicious redirector. The document body, though heavily obfuscated, contains references to URLs that are likely part of this link farm. The presence of a malicious redirector suggests an attempt to lure users to malicious websites, potentially for phishing or malware distribution.

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=full+hd+punjabi+couple+wallpaper
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://static.usrfiles.com/ugd/b8c837_12918248429a48a5a194bf0ac226cdbc.pdf
    • https://static.usrfiles.com/ugd/b8c837_be3b6c19ec5842778bde5634da6edbf4.pdf
    • https://static.usrfiles.com/ugd/625844_1dbff4ec180649329ceb412417f76000.pdf
    • https://static.usrfiles.com/ugd/b8c837_00b0f315ce69400b92392478d17f8673.pdf
    • https://cdn.shopify.com/s/files/1/0432/2282/7165/files/21565031501.pdf
    • https://cdn.shopify.com/s/files/1/0439/3231/9912/files/66073324624.pdf
    • https://cdn.shopify.com/s/files/1/0433/4003/8302/files/human_stomach_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0429/8076/9951/files/30029447055.pdf
    • https://static.usrfiles.com/ugd/b8c837_0dbe673e0fad465ca3f6a0cec99cd676.pdf
    • https://static.usrfiles.com/ugd/ec0c41_4cb622dd81e94dea8c0bc2e75400898a.pdf
    • https://static.usrfiles.com/ugd/3be3a7_a250d46b4e9e4c6183cb0e15306d40b4.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060f9.bin
a58e0e8221d44c5d3cff7d0610482075311a29de483855bc2934a4790443098b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F9 5248 bytes
font_01_sfnt_off000072d7.bin
73ac2dee482503cffc6040c7a1967e21b88cc8a6941231915d3a8263cde1a4e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D7 9384 bytes
font_02_sfnt_off000090c2.bin
ad261b407cd281e892b4cb611faf4cb71cd68cb88bc8ed3325b17d42451c96bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90C2 5716 bytes
font_03_sfnt_off0000a4fa.bin
086944b6d56c3ab4198f2090b3c7b736a0a40196bbd8a0bea8c80a336d8e6d9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4FA 14476 bytes
font_04_sfnt_off0000d298.bin
33ed3407504130199e84fab64ce225d5d72cef21a9b294a735ddad71faa3765d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD298 18328 bytes

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