Malicious PDF — malware analysis report

Static analysis result for SHA-256 641fd855a696febe…

MALICIOUS

PDF

42.3 KB Created: 2020-08-06 18:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0821728fdc85782e848007aa7a54dfac SHA-1: 5ba75139716144f08f7d36ed32721c9fdf15ca70 SHA-256: 641fd855a696febe359ab59f27efe00ea587b4a7e21bd6f2b48d8806256787b6
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=agricultural+research+topics+pdf', suggesting a lure to external content. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, further supporting the redirection to potentially malicious 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.cc/pify?keyword=agricultural+research+topics+pdf
    • http://files.reanalysts.net/uploads/1/3/0/7/130775286/ritavaxofibalo.pdf
    • http://files.sensibleshock.com/uploads/1/3/2/7/132740479/vasesejakukek_faxej_lelikam.pdf
    • http://pitajof.rangewaysupply.com/uploads/1/3/1/6/131637649/962ca9a0a63e775.pdf
    • http://files.minipantos.com/uploads/1/3/1/6/131636965/7863924.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4162/8053/files/popuxuteliwitukox.pdf
    • https://cdn.shopify.com/s/files/1/0431/1321/8210/files/23906717701.pdf
    • https://cdn.shopify.com/s/files/1/0440/0598/2366/files/80224111235.pdf
    • https://cdn.shopify.com/s/files/1/0438/2998/5430/files/27104225282.pdf
    • https://cdn.shopify.com/s/files/1/0436/5228/4566/files/peropijavidivijavosakopu.pdf
    • https://cdn.shopify.com/s/files/1/0443/1645/9164/files/mayka_marika_kukucova.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2093/files/nativa_mitsubishi_2016.pdf
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/engineering_mechanics_dynamics_2nd_edition_gray.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/tikiwivowosopamulerevaxid.pdf
    • https://cdn.shopify.com/s/files/1/0436/3550/7358/files/javascript_basics_for_beginners_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/6910/4540/files/90926752071.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/working_principle_of_ammeter.pdf
    • https://cdn.shopify.com/s/files/1/0440/8449/4488/files/rewokop.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67264452348.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_off0000667c.bin
24c845716a8bcc6fede6809364a99f425fa87b73df1f82f8c1d5e419e7095ae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x667C 5408 bytes
font_01_sfnt_off000078df.bin
c49e1d60e9ed584bec5f7b3fa11ed61de0302c03433dd92bc4113b8002c78c68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78DF 10340 bytes

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