Malicious PDF — malware analysis report

Static analysis result for SHA-256 b620a8ba946edf3b…

MALICIOUS

PDF

35.0 KB Created: 2020-08-30 23:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86594043fe12b6fd992fd10dea5433a1 SHA-1: 64fc30b8840ca000e004eb0cd335362f933f77d9 SHA-256: b620a8ba946edf3b268bdddf4491cff227dc438e273f6512eed5cb3226f82ef7
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to known malicious infrastructure. Additionally, a PDF_SEO_LINK_FARM heuristic fired, revealing a mass of external PDF links within the document. The primary malicious URL identified is https://ttraff.ru/wix?keyword=star+spangled+banner+sheet+music+vio. The document body, though heavily obfuscated, contains references to this URL and other PDF links, reinforcing the attack pattern of link farming and redirection.

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/wix?keyword=star+spangled+banner+sheet+music+vio
    • https://static.usrfiles.com/ugd/30e015_9d51d2f887c5486b906eb4fef3780719.pdf
    • https://static.usrfiles.com/ugd/451461_49d59b0493ef4163ae22bc5493b0050c.pdf
    • https://static.usrfiles.com/ugd/299074_67aa9e37bf8343b6b12a5ab982464d9f.pdf
    • https://static.usrfiles.com/ugd/b8c837_95bde3f0ece449be9e72462082bb8498.pdf
    • https://static.usrfiles.com/ugd/b8c837_95d3cb5d56764b24be6e54d0e39ab094.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_033164b99c7b4aacb5ec1b167aa572bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0b9f2e80a844d1cba436aabd9056d62.pdf
    • https://static.usrfiles.com/ugd/95089d_d9400aafd48c4f168a7f0b65ea73fff4.pdf
    • https://static.usrfiles.com/ugd/a18aa6_4af46910b75a4b97a8b0447e0235c862.pdf
    • https://static.usrfiles.com/ugd/cc089a_661e93d83c0f4bbfb2fb7989ef2f0df7.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/birizakidunupujudexi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4479/7605/files/papoulis_probability.pdf
    • https://cdn.shopify.com/s/files/1/0435/5453/7624/files/90709796001.pdf
    • https://cdn.shopify.com/s/files/1/0440/2262/8502/files/american_history_apush_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/99762582037.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_off00004a30.bin
1dcd2b7a9a05e2ff986a111d6b47045cc81e6c8b9c6f45b70a0f1d8d9845dd6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A30 5792 bytes
font_01_sfnt_off00005dae.bin
2cd9bc83b05a7f5905b981ce5038279fd94159b42e28b557ed9b1d6f88ace801		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DAE 9848 bytes

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