Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3d76616ef6c142…

MALICIOUS

PDF

48.6 KB Created: 2020-07-30 06:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a14939dbddb0590f53b37f591d68d31b SHA-1: b6a4c7f041a82ade76e286e222815ceed0f9e325 SHA-256: af3d76616ef6c1428032256bf751837d1717308955236fc74335feff9b00d078
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. This URL is part of a link farm designed to artificially inflate search engine rankings and redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to 'lecture notes'. The presence of numerous embedded URLs, many hosted on Shopify, suggests a large-scale SEO poisoning campaign. The ML classifier also 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.ru/pify?keyword=formal+language+and+automata+theory+lecture+notes+pdf
    • http://files.elawithmsionut.com/uploads/1/3/0/7/130775808/nepuribuselimurewu.pdf
    • http://files.myhealthplanz.com/uploads/1/3/1/3/131379868/2599184.pdf
    • http://files.haydentheater.org/uploads/1/3/0/8/130813887/xezenizivejugim_fifomewejidari_xovifozi_kubikip.pdf
    • https://cdn.shopify.com/s/files/1/0429/2011/6387/files/74127739749.pdf
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/novuputiniretukuve.pdf
    • https://cdn.shopify.com/s/files/1/0430/5800/4117/files/67199872089.pdf
    • https://cdn.shopify.com/s/files/1/0435/9005/8152/files/87234708419.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/sosogufafelamawo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5316/files/44911714442.pdf
    • https://cdn.shopify.com/s/files/1/0436/4589/4816/files/xalogode.pdf
    • https://cdn.shopify.com/s/files/1/0431/1128/4893/files/37049408100.pdf
    • https://cdn.shopify.com/s/files/1/0433/3423/8362/files/forusazig.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/lawadevu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076be.bin
1498b997481f1a8dd1209f12d4e08b447b7e7488b8d07bb1ab0c4cc8884d2035		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76BE 5460 bytes
font_01_sfnt_off0000892d.bin
6e8677238a765cc8b8733b3e366598b1f7efe11f5b867311b52decad93faa372		 pdf-font-stream PDF embedded font (sfnt) at offset 0x892D 13856 bytes

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