Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d4bfb903abfd92…

MALICIOUS

PDF

42.9 KB Created: 2020-08-26 12:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad38db73f78b979074c7fa1e8cd1fee8 SHA-1: 34c41fc48d3fc1f0f4ee61f6a39fbc2e989e8a4d SHA-256: 23d4bfb903abfd92bcd347efd9dc54ca6d8370c1d99732c4abd9123d1424740c
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDFs hosted on Shopify. One of these links, https://ttraff.com/pify?keyword=what+is+conduction+current, is identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain the same URL, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=what+is+conduction+current
    • http://zasesoru.hpathcounseling.com/uploads/1/3/0/7/130776394/6348137.pdf
    • http://files.ngbeautymakeupstore.com/uploads/1/3/0/8/130813428/8830649.pdf
    • https://cdn.shopify.com/s/files/1/0430/7025/9357/files/dosufuko.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/lafelun.pdf
    • https://cdn.shopify.com/s/files/1/0462/6179/7013/files/38628457170.pdf
    • https://cdn.shopify.com/s/files/1/0429/4914/8838/files/20008123029.pdf
    • https://cdn.shopify.com/s/files/1/0437/0310/7752/files/41548494208.pdf
    • https://cdn.shopify.com/s/files/1/0434/8208/7588/files/zoligusidipabuwibavuru.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/80138260755.pdf
    • https://cdn.shopify.com/s/files/1/0459/9303/3887/files/340687443.pdf
    • https://cdn.shopify.com/s/files/1/0459/9942/3647/files/english_grammar_rules.pdf
    • https://cdn.shopify.com/s/files/1/0436/3531/0752/files/random_drawing_idea_generator.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1637/files/97239762555.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/49736698347.pdf
    • https://cdn.shopify.com/s/files/1/0433/8191/5802/files/wojukatexav.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/
    • https://cdn.shopify.com/s/files/1/0436/3531/0752/files/random_drawing_idea_generato

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b7c.bin
aa7983b724c9d81eb3dc074e50739aaed501282b986d491feb99efa37ed63208		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7C 5008 bytes
font_01_sfnt_off00007c77.bin
a79f96e289ae2e821879bded4b1c0b020847afdd03e0a8a088a09f05b5d44f02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C77 10008 bytes

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