Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eef705c8a4bd28e…

MALICIOUS

PDF

42.3 KB Created: 2020-09-29 09:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0357129844033a6fcbad1da6a32cc9de SHA-1: 0590a84c50e2b4ae43ec3e6c1897e3b1c6f20682 SHA-256: 0eef705c8a4bd28ec368b4bde4192abe951b6873825e7046c8fcd066d255cc94
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 pointing to SEO-optimized PDF files, a technique often used for link farming or to distribute malware. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ggtraff.ru/mozel?keyword=minimalism+live+a+meaningful+life+free+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting 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://ggtraff.ru/mozel?keyword=minimalism+live+a+meaningful+life+free+pdf
    • https://site-1036894.mozfiles.com/files/1036894/nezasibipon.pdf
    • https://site-1036960.mozfiles.com/files/1036960/11051674129.pdf
    • https://site-1036995.mozfiles.com/files/1036995/30997878072.pdf
    • https://site-1037282.mozfiles.com/files/1037282/moloviluwavopadojegas.pdf
    • https://site-1037091.mozfiles.com/files/1037091/falapetejir.pdf
    • https://site-1036680.mozfiles.com/files/1036680/jaserimogekajudomeneluno.pdf
    • https://site-1037192.mozfiles.com/files/1037192/fokivisasuze.pdf
    • https://site-1036818.mozfiles.com/files/1036818/livegepefumelo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1722/3840/files/12951480416.pdf
    • https://cdn.shopify.com/s/files/1/0429/0464/9884/files/kedisijiwigoluj.pdf
    • https://cdn.shopify.com/s/files/1/0441/3744/7576/files/wuwovedoxuvawibun.pdf
    • https://cdn.shopify.com/s/files/1/0432/9819/3566/files/possessive_adjectives_easy_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0433/4632/9750/files/bixaropopujo.pdf
    • https://cdn.shopify.com/s/files/1/0439/5335/6955/files/non_probability_sampling_design.pdf
    • https://cdn.shopify.com/s/files/1/0432/2862/7107/files/auriculoterapia_libro.pdf
    • https://cdn.shopify.com/s/files/1/0433/9017/3349/files/lewebuwoguxezojanifivabez.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066ef.bin
6c1aaa0525bc465cfa4724bf33fff0012f0e7aa81a1d9053d3d85ebcb56c2b93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66EF 5428 bytes
font_01_sfnt_off00007960.bin
869676ccf6ede3e97d148b8b1d6401f4435ee6c6bb2a1feb9b21e78ba1be0f4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7960 10200 bytes

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