Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b681d206b39c1b8…

MALICIOUS

PDF

57.6 KB Created: 2020-08-12 17:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8e108567e5d1016feda7b283d2850fa SHA-1: 2d299e2801a8201e7e8ae9e60ae7274dc2b94a0c SHA-256: 5b681d206b39c1b809fdeb39d40d2d3949f24546a00d9daa564e14e00d019e80
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 sites, indicating a link farm or redirection scheme. One of the primary links, 'https://ttraff.ru/pify?keyword=caries+dental+diagnostico+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains what appears to be a URL, but it is not directly executable.

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/pify?keyword=caries+dental+diagnostico+pdf
    • http://files.ifeomaanyaeji.com/uploads/1/3/1/3/131383860/7178452.pdf
    • http://files.smugshots.co.za/uploads/1/3/0/9/130969772/sabasitex_taveginexowupun_bijemaruw_xireguviwesupo.pdf
    • http://files.mygasz.com/uploads/1/3/1/8/131856353/norisafuga.pdf
    • http://dewepora.lakeside-kennel.com/uploads/1/3/2/6/132696434/8874462.pdf
    • http://files.thebeaverracing.com/uploads/1/3/0/7/130776164/614965.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20807514836.pdf
    • https://cdn.shopify.com/s/files/1/0431/4015/3505/files/pipinalodavenegadufeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5159/files/10935311437.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/88020392138.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71860998709.pdf
    • https://cdn.shopify.com/s/files/1/0433/6310/6968/files/18755468210.pdf
    • https://cdn.shopify.com/s/files/1/0432/0516/5216/files/mamabijusoxojaxoxekup.pdf
    • https://cdn.shopify.com/s/files/1/0434/3011/7526/files/descargar_libro_caballo_de_troya_9.pdf
    • https://cdn.shopify.com/s/files/1/0431/9733/3668/files/sujid.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9663/files/47759235441.pdf
    • https://cdn.shopify.com/s/files/1/0433/8299/7148/files/science_10_textbook_alberta_addison_wesley.pdf
    • https://cdn.shopify.com/s/files/1/0432/4520/7714/files/zebajavapofi.pdf
    • https://cdn.shopify.com/s/files/1/0440/5172/6501/files/65276582505.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9786/files/11455327287.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f28.bin
bb83627cd20bf31711fcb0654c470005b54712073d22510df10ff05803236f66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F28 5228 bytes
font_01_sfnt_off0000a103.bin
3bece9210baa563dfc9331d8a29b5d4a96563f64264173f38723876924ae95a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA103 10208 bytes
font_02_sfnt_off0000c3f5.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F5 16204 bytes

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