Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e04f20ddd75912…

MALICIOUS

PDF

36.4 KB Created: 2020-08-19 11:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cef50ef0a176f5cf757ede61a3fecb00 SHA-1: c01a592cd67ad412958e81d867192e87ece453e9 SHA-256: c4e04f20ddd759127ba908cd57088ae696fe53c3845655f55afb76e61c16781e
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure, specifically 'ttraff.ru'. Additionally, it contains a large number of embedded links, identified as a PDF link farm, with many pointing to Shopify domains. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to potentially harmful external sites through these numerous links.

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=bible+commentary+audio
    • http://jekugad.inescapableclothing.com/uploads/1/3/1/4/131454029/zuwonigijipi-guzejol-xowopolunom-rasolaguf.pdf
    • http://files.whistlingfrogresort.com/uploads/1/3/2/6/132681002/masaberilanimubaloji.pdf
    • http://files.bysophschnei.com/uploads/1/3/1/3/131380213/gakegiwubasopisadi.pdf
    • http://luxugame.tranbcreative.com/uploads/1/3/1/3/131383544/6348880.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/13469714848.pdf
    • https://cdn.shopify.com/s/files/1/0433/5196/5855/files/41779359807.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lavijado.pdf
    • https://cdn.shopify.com/s/files/1/0448/2108/6368/files/que_es_moral_segun_autores.pdf
    • https://cdn.shopify.com/s/files/1/0432/7089/7824/files/33075585301.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/cctv_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9236/files/engineering_company_profile_design.pdf
    • https://cdn.shopify.com/s/files/1/0452/2138/0247/files/free_apron_sewing_pattern.pdf
    • https://cdn.shopify.com/s/files/1/0436/9616/0923/files/lymphatic_drainage_of_tongue.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0319/files/gofewazexokagadi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4338/9597/files/how_to_program_directv_remote_to_tv.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/39698517859.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_off00004f9f.bin
95117f5d61d5e066cf9f2e8022cdc8192514095ef90ec77c0a522b93df627aab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F9F 5200 bytes
font_01_sfnt_off00006129.bin
68435ef8b50e00111d6e13700c27bbc1d8804aa0b4821962cad23155c3aa1a67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6129 10636 bytes

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