Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47058e32c15957a…

MALICIOUS

PDF

72.8 KB Created: 2020-08-29 21:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 171eeb91b77496a322986a4f854b5a87 SHA-1: 499c959b581ac4841d7b9ce773f277c228ac34ef SHA-256: d47058e32c15957a00473e74709ee743798da56b2e13ebbbf7c042d0a6cd9340
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains text related to 'O grande inquisidor resumo' and the wkhtmltopdf application, but the primary malicious activity appears to be the extensive use of embedded URLs designed to redirect users to potentially harmful sites.

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=o+grande+inquisidor+resumo
    • https://static.usrfiles.com/ugd/c12414_2104e827b635416b84b8a8c4700bd8e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a4cae82db8a4895beefe852f0f8c0db.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ce5197c9e444e41af22a31f73cc618d.pdf
    • https://cdn.shopify.com/s/files/1/0448/0129/4496/files/mikiz.pdf
    • https://cdn.shopify.com/s/files/1/0438/2064/6562/files/ligivijalelepewaseda.pdf
    • https://cdn.shopify.com/s/files/1/0431/6269/7894/files/9619450249.pdf
    • https://cdn.shopify.com/s/files/1/0429/0222/5059/files/geletokekegofod.pdf
    • https://cdn.shopify.com/s/files/1/0438/9103/2216/files/79727645398.pdf
    • https://static.usrfiles.com/ugd/b8c837_dbfb65b7e1a24f628eca6b1112a25e08.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ce47466429d4bdca5794bf32e4d3d28.pdf
    • https://static.usrfiles.com/ugd/b8c837_e643396ce4e442aeb3109134a0ba0706.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fd7f8ff25d8455e83d95834c6718109.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad6c75197fe849a4a8c39df611127de6.pdf
    • https://cdn.shopify.com/s/files/1/0432/7568/1947/files/65465064002.pdf
    • https://cdn.shopify.com/s/files/1/0429/7100/5082/files/dr_jart_firming_solution_sheet_mask.pdf
    • https://cdn.shopify.com/s/files/1/0430/6580/2903/files/autocad_2014_crack_version.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/pesodegufaroxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9658/files/agritourism_book.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc4c.bin
d4370b3bbbc35329f68cf832ca090007a51b2e49de22e178ac9f84eee3ecc3e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4C 5264 bytes
font_01_sfnt_off0000ee10.bin
11ae687db314ac2865b708585d31152a045c932099d96a9d57b605376f74fc4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE10 12912 bytes

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