Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5f4be5aa586671…

MALICIOUS

PDF

46.5 KB Created: 2020-08-19 09:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56ebc24235d2a6b09c65a1e58824267f SHA-1: 5d558ef23ca7d7c3f8e3c3ad1eec0193eda47400 SHA-256: 9c5f4be5aa5866719f0486c26d9f040a59164c5628987fdbb796498fa82b459a
120 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a string that appears to be a lure for a 'cell cycle coloring worksheet', and the primary malicious URL is also present within the document body. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, suggesting a broader campaign to distribute malicious content.

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=cell+cycle+coloring+worksheet
    • http://files.beautymarxmed.com/uploads/1/3/0/7/130776720/b7fa3d73fd70f81.pdf
    • https://cdn.shopify.com/s/files/1/0433/4744/3865/files/36377081960.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8658/files/fefogozomezu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/7904117193.pdf
    • https://cdn.shopify.com/s/files/1/0435/2606/2239/files/antisepsia_concepto.pdf
    • https://cdn.shopify.com/s/files/1/0430/3929/3589/files/rekefuri.pdf
    • https://cdn.shopify.com/s/files/1/0434/0868/7269/files/pewepivopaxuru.pdf
    • https://cdn.shopify.com/s/files/1/0434/0695/0561/files/filona.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/espn_fantasy_football_cheat_sheet_by_position.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4216/files/97953049155.pdf
    • https://cdn.shopify.com/s/files/1/0433/9708/7390/files/sanudoxo.pdf
    • https://cdn.shopify.com/s/files/1/0436/1669/8530/files/nonujowa.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_off000077de.bin
571abaeb1ba2787fb38d58d633854c611e3c644c57b02d931f6107905ce7cd1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77DE 5016 bytes
font_01_sfnt_off000088ff.bin
950ca43ba52e90ef17d7a0a5b0fd9054b7877d797e3a96f755b341005ee9b4c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88FF 10472 bytes

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