Malicious PDF — malware analysis report

Static analysis result for SHA-256 191ea3843302a67f…

MALICIOUS

PDF

45.7 KB Created: 2020-08-28 06:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b82f0edfacbb7fed6a398cf010b80875 SHA-1: 36dc890c9a9ceab3702d75de5e5cc8b41f3a83f4 SHA-256: 191ea3843302a67ffe0fb4e402303f9ecf02978ef5c4c207ce0f9a521fae3abf
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as information about a service dog. This link, 'https://ttraff.me/pify?keyword=why+does+drew+have+a+service+dog', leads to a malicious URL. The document also features a large number of external PDF links, many hosted on Shopify, which is indicative of a link farm used for SEO poisoning or to obscure malicious destinations. The ML classifier strongly flagged this PDF as malicious.

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.me/pify?keyword=why+does+drew+have+a+service+dog
    • http://files.oneactioncalendar.org/uploads/1/3/1/4/131408970/cc4571ed8.pdf
    • http://zaxigum.hollyspringswellnessgroup.com/uploads/1/3/1/4/131438672/tipof_pifemasumi_demajezop_wisegi.pdf
    • http://files.westernspringsbuilder.com/uploads/1/3/2/7/132740307/damatozazev.pdf
    • https://cdn.shopify.com/s/files/1/0431/4179/1895/files/mivodalus.pdf
    • https://cdn.shopify.com/s/files/1/0439/0351/6824/files/czardas_piano_accompaniment_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0439/2789/6219/files/jonilevileranufubetafope.pdf
    • https://cdn.shopify.com/s/files/1/0435/3009/2712/files/pwc_guide_to_doing_business_in_australia.pdf
    • https://cdn.shopify.com/s/files/1/0438/1658/3325/files/togexogebomololimuxozafub.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2103/files/93336958660.pdf
    • https://cdn.shopify.com/s/files/1/0428/4196/4710/files/82153109559.pdf
    • https://cdn.shopify.com/s/files/1/0435/2193/3466/files/1190855164.pdf
    • https://cdn.shopify.com/s/files/1/0428/5241/7703/files/30507086377.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/67395786624.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39720928980.pdf
    • https://cdn.shopify.com/s/files/1/0434/4345/4102/files/algorithms_4th_edition_by_sedgewick_and_wayne.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_off000073e8.bin
2d7f5d14b5235025b9d79eaddf28f4b557f7dc9616059c645efd6ee99eb32b12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E8 5436 bytes
font_01_sfnt_off00008685.bin
4e07d3d351cfcd97b0c2f445c6ebc3b831f70eacd3ebd9c1aaca63e51162889d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8685 10560 bytes

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