Malicious PDF — malware analysis report

Static analysis result for SHA-256 164d421a3b9b155d…

MALICIOUS

PDF

46.6 KB Created: 2020-08-23 16:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b45802aaf428e1aabbf284a5a1933d34 SHA-1: 979b7c39f77d26b3d85e86200130892c4e96aefc SHA-256: 164d421a3b9b155dd372ff0b34e71cf09c51433ca7b9d1c9e57f93cbc4ab9ab0
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 pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or traffic redirection. One prominent link, disguised as an NFL fantasy football cheat sheet, directs to a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a malicious intent to redirect users to potentially 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.ru/pify?keyword=nfl+fantasy+mock+draft+2019+cheat+sheet
    • http://files.rnativephotos.com/uploads/1/3/2/6/132681448/c7b87ac61.pdf
    • http://files.mitalentzcompany.com/uploads/1/3/2/3/132302966/211867.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0700/0219/files/65418101567.pdf
    • https://cdn.shopify.com/s/files/1/0439/9998/5822/files/dutasuxixot.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/59967912411.pdf
    • https://cdn.shopify.com/s/files/1/0433/5278/5055/files/kegipibu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/ramebeba.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9658/files/35524412175.pdf
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/73713426186.pdf
    • https://cdn.shopify.com/s/files/1/0435/1367/5930/files/dejilizaze.pdf
    • https://cdn.shopify.com/s/files/1/0434/1907/4712/files/nike_tracksuit_top_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/5025/3979/files/naposatelifof.pdf
    • https://cdn.shopify.com/s/files/1/0428/4956/6886/files/timken_needle_roller_bearings.pdf
    • https://cdn.shopify.com/s/files/1/0435/3087/9125/files/69404698028.pdf
    • https://cdn.shopify.com/s/files/1/0434/0174/0439/files/akreditasi_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0430/4817/3722/files/bamurizepesone.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_off000075ba.bin
039891ea8e658c075f726451a133ee378a5521430f78b4237df0c99c14035607		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75BA 5876 bytes
font_01_sfnt_off0000899c.bin
1a0f43ea2c8c017ad5fec9f577cc1da366ef8cc369bf4dd875c8225c144459c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x899C 10520 bytes

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