Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2431cf8a2535d67…

MALICIOUS

PDF

39.4 KB Created: 2020-08-11 05:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c04fe1d1c20b4dc9460ad954190e19bb SHA-1: 153fb135fcd23b4c24f6bbf2876f9325cf110775 SHA-256: b2431cf8a2535d67a4d8576847b144d868c4e0052b38192069e07ff601f5b728
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm, with the primary redirector URL being https://ttraff.ru/pify?keyword=the+end+justify+the+means+pdf. This suggests the document's purpose is to lure users to malicious sites. 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.ru/pify?keyword=the+end+justify+the+means+pdf
    • http://files.cybersecurityinc.net/uploads/1/3/2/6/132681938/natuwafegaga.pdf
    • http://files.milfordscarlethawks.com/uploads/1/3/0/7/130740092/mikipesamifom-dujijosewopog-nomafapibovozo.pdf
    • http://files.donviecelli.com/uploads/1/3/1/3/131379039/wolekulemopowat-sotukolobivuj.pdf
    • http://nenujekak.promablocks.com/uploads/1/3/2/6/132680813/dapoli.pdf
    • https://cdn.shopify.com/s/files/1/0435/3366/4408/files/55382414885.pdf
    • https://cdn.shopify.com/s/files/1/0431/1705/2053/files/besinger_score.pdf
    • https://cdn.shopify.com/s/files/1/0432/6948/8798/files/pevebovawozar.pdf
    • https://cdn.shopify.com/s/files/1/0434/8257/9110/files/wugokezatidafelijobejano.pdf
    • https://cdn.shopify.com/s/files/1/0447/7501/4566/files/champions_league_matches.pdf
    • https://cdn.shopify.com/s/files/1/0429/4030/1478/files/3991164367.pdf
    • https://cdn.shopify.com/s/files/1/0439/7613/0718/files/annabac_terminale_s.pdf
    • https://cdn.shopify.com/s/files/1/0433/6589/2261/files/9185039131.pdf
    • https://cdn.shopify.com/s/files/1/0434/8398/8125/files/accounting_warren_26th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2221/files/gisaleg.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6384/files/27426811807.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_off00005cf2.bin
22eeecc64d5495c98eb1af24194cab6eb25bccd243a1d489ca7ab308af1a0b0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CF2 5280 bytes
font_01_sfnt_off00006ed0.bin
475339cc58ad25463203d97c9c1a3b5dd90841331d6b6c7e6ec77a3a4310f852		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED0 9964 bytes

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