Malicious PDF — malware analysis report

Static analysis result for SHA-256 47e72fbf876b435b…

MALICIOUS

PDF

39.2 KB Created: 2020-08-18 17:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b10e20e09e45da967d2423ae2455ba88 SHA-1: b35262614c0a97e1204878f00ec8c5b078f94564 SHA-256: 47e72fbf876b435b6981a0e48cc0fe1839f9cabb71ae5974543e8e48ddf1a949
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=anatomy+directional+terms+practice+answers, suggesting a lure to a malicious site. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves tricking the user into visiting a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=anatomy+directional+terms+practice+answers
    • http://wijinovo.ed-gecation.com/uploads/1/3/1/4/131453501/tikumawe.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/nirvana_discography_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1357/files/mipofomoniwa.pdf
    • https://cdn.shopify.com/s/files/1/0434/9159/0308/files/90417294108.pdf
    • https://cdn.shopify.com/s/files/1/0430/0128/2711/files/cisco_jabber_12._5_end_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/99367361369.pdf
    • https://cdn.shopify.com/s/files/1/0433/9816/8727/files/gipemusenevo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4947/6518/files/6389993887.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/bobalerukipuximafirelu.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_off00005b7c.bin
fd2cf12055aa16db6e26b7dee09af543eace208a302ca9020fc1e931034b65a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B7C 5404 bytes
font_01_sfnt_off00006dd6.bin
979091a1ad6c17b90f1da3804c00984352087277ba9dd4bbac958831f77ddf1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD6 10088 bytes

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