Malicious PDF — malware analysis report

Static analysis result for SHA-256 99475ad90137df5c…

MALICIOUS

PDF

44.9 KB Created: 2020-08-31 11:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ae4d7af9002d7465523697ba2e2601f SHA-1: b9862578360ee3b0fc951743f0707b99173cd362 SHA-256: 99475ad90137df5cf140397c7a2a0cd1a47df06a6eafe9e4611c132c51ce3f5a
120 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, specifically linking to a known malicious redirector and a link farm. The embedded URL 'https://ttraff.com/wix?keyword=vihtavouri+reloading+data' is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting it's the primary lure. The presence of numerous external PDF links, many pointing to static.usrfiles.com, further supports a link farm strategy, likely to improve SEO for malicious content or to obscure the final destination.

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/wix?keyword=vihtavouri+reloading+data
    • https://static.usrfiles.com/ugd/50c35f_21c09f7477764603b4157eb7299002ad.pdf
    • https://static.usrfiles.com/ugd/c1615c_e15d475b1c8742c2893d33cd53992cdd.pdf
    • https://static.usrfiles.com/ugd/930050_3e2103821180461abb8016d359700688.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/tamopit.pdf
    • https://cdn.shopify.com/s/files/1/0435/5696/2467/files/30198640995.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8909/files/botuguxeduzamojasifenero.pdf
    • https://cdn.shopify.com/s/files/1/0429/1287/4662/files/atomistique_exercice.pdf
    • https://cdn.shopify.com/s/files/1/0433/1762/4990/files/defejomogaridarex.pdf
    • https://static.usrfiles.com/ugd/d54300_cd8e7bab815e410fa38f5bd581e26961.pdf
    • https://static.usrfiles.com/ugd/b8c837_52090792789c447db2ed2b25b9c8073f.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_off00007195.bin
3d045a4511f4d9961cf9606d9f8f8c7e318defa0ec38d299b207d86c01f82967		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7195 4932 bytes
font_01_sfnt_off0000825f.bin
9626e0ce9eceee1796f8870fa48d89350bea08b8cefec2f78f7ab2be3b4051c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x825F 10684 bytes

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