Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4101fe5c1d9c63…

MALICIOUS

PDF

47.8 KB Created: 2020-08-25 14:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a245810228c6027f7526993a785c9d0 SHA-1: 9b42e631c8528180978f8f41fc26a64a2da86907 SHA-256: 5a4101fe5c1d9c637d552180513c2e5f15010d482b02d00f6915c04d8c5d4f80
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 a link farm infrastructure. One prominent URL, 'https://ttraff.cc/pify?keyword=accounting+vocabulary+english+german+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting it's the primary lure. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it's designed to redirect users to harmful 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://ttraff.cc/pify?keyword=accounting+vocabulary+english+german+pdf
    • http://rasup.wisconsinwaterlaw.com/uploads/1/3/1/4/131409236/lijugamukuluduwaw.pdf
    • http://kanifa.dmcicondoliving.com/uploads/1/3/1/4/131453494/bifeguxeto.pdf
    • http://files.michelemyoga.com/uploads/1/3/1/4/131454151/lupiwovajijefiwilesa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2009/0535/files/83688214386.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lojuxefututa.pdf
    • https://cdn.shopify.com/s/files/1/0439/4303/5048/files/43106309985.pdf
    • https://cdn.shopify.com/s/files/1/0435/8658/4733/files/63376772506.pdf
    • https://cdn.shopify.com/s/files/1/0436/3635/9326/files/besegowumegozijogemelofe.pdf
    • https://cdn.shopify.com/s/files/1/0435/4405/1871/files/33766850585.pdf
    • https://cdn.shopify.com/s/files/1/0435/3484/4059/files/1v1_minecraft_servers.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/48980836278.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/7165469409.pdf
    • https://cdn.shopify.com/s/files/1/0431/2485/0842/files/patojekelow.pdf
    • https://cdn.shopify.com/s/files/1/0436/6332/7385/files/17501074733.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9877/files/92077600724.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_off00007be7.bin
5f8dfad2952c5ec3798ed13a7fc4c5c77ebce15a5559ac91459f7ce3777008c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE7 5860 bytes
font_01_sfnt_off00008faa.bin
cb59074b4da348ac666dfee97f698c7dafba14eaa52955a7d4ba20e4f6756e85
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FAA 10088 bytes