Malicious PDF — malware analysis report

Static analysis result for SHA-256 d270f321a9d3ce7d…

MALICIOUS

PDF

34.9 KB Created: 2020-08-30 16:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a0e146d504f5c7f821a1a8c89f09f5c SHA-1: 023137abdc6ab4fe1cbe69e8247716f1ddfe8d6b SHA-256: d270f321a9d3ce7d6d99dd95ff2c4502967222438b9788eea26f79abf85de6c7
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic firing indicating a PDF link farm. One of these links, 'https://ttraff.link/wix?keyword=querer+conjugation+worksheet', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF files, suggesting a lure to a malicious site. The presence of numerous external links points towards a SEO-based spam campaign or a link farm designed 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.link/wix?keyword=querer+conjugation+worksheet
    • https://static.usrfiles.com/ugd/b8c837_7b8697ee309d48c9b1c8779998d8d11d.pdf
    • https://static.usrfiles.com/ugd/a298ce_454316ef0f674eb2aaffef0f80abd7a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_854c2fd46a664c888cd916e048a33000.pdf
    • https://static.usrfiles.com/ugd/33ab24_fba022050c294b9fac4aa8637137d415.pdf
    • https://static.usrfiles.com/ugd/b8c837_60e58ff5224a480da5784657af1b4e42.pdf
    • https://static.usrfiles.com/ugd/b8c837_53b723ca448249d7b193bc810be51e90.pdf
    • https://cdn.shopify.com/s/files/1/0432/5058/1662/files/heyaw_lisan_geez_amharic_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0435/0004/4440/files/72147947972.pdf
    • https://cdn.shopify.com/s/files/1/0433/2870/0571/files/nibivurofipog.pdf
    • https://cdn.shopify.com/s/files/1/0433/8365/2506/files/5222589810.pdf
    • https://cdn.shopify.com/s/files/1/0434/1288/1564/files/42205963649.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_off00004bd5.bin
1b13cd411a9277821eff04c0746fd5482bb7834ceb102e03bca743396b6e9e0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BD5 5320 bytes
font_01_sfnt_off00005e06.bin
80a597325e25cfb4eff36b654dabd985139eb3d825eba741bada8fb0a733205f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E06 9868 bytes

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