Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78bbb18f675e51d…

MALICIOUS

PDF

43.2 KB Created: 2020-08-12 19:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8285fa455d30ffcf427d20f39303ae00 SHA-1: 0a58549a445e12050207db0266dcd82dcaedd909 SHA-256: a78bbb18f675e51d78fa8912730972c1f16b0aa0b7e981dd914a68f69251aab7
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains references to the redirector URL and other URLs hosted on Shopify, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites. No scripts were extracted from this sample.

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/wb?keyword=paralisis%20facial%20periferica%20pediatria%20pdf
    • http://files.christineleecounselling.com/uploads/1/3/0/7/130739146/698759f6af0361e.pdf
    • http://files.pumpkincurioushistory.com/uploads/1/3/2/6/132682826/1087e0b87d3111.pdf
    • http://files.athleticfootballgroup.com/uploads/1/3/2/7/132710791/wisar.pdf
    • http://files.humanbeinghumanrights-eng.org/uploads/1/3/1/1/131164473/bixitojekazax-kojaseg.pdf
    • https://cdn.shopify.com/s/files/1/0430/0279/0039/files/jotuwakus.pdf
    • https://cdn.shopify.com/s/files/1/0445/9554/4228/files/server_administrator_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/western_auto_crafters.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0946/files/reverse_a_singly_linked_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/0152/0029/files/finadevujenemeguzom.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2948/files/80953665279.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/xaludanebiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/construction_supervisor_license.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/55567290288.pdf
    • https://cdn.shopify.com/s/files/1/0445/6490/6148/files/bateria_de_riesgo_psicosocial_ministerio_de_trabajo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8280/8472/files/41223119563.pdf
    • https://cdn.shopify.com/s/files/1/0436/1093/1358/files/mipixosozumu.pdf
    • https://cdn.shopify.com/s/files/1/0439/4795/0248/files/95841035709.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_off00006839.bin
4e92892ad1091306a3fadc0f02d860235ff98b295875b097786767984803f508
pdf-font-stream PDF embedded font (sfnt) at offset 0x6839 5152 bytes
font_01_sfnt_off000079c5.bin
854e6259590aff26a6313f5449c8b428e400f52e177b1a3d25a9553d1427ad40
pdf-font-stream PDF embedded font (sfnt) at offset 0x79C5 11168 bytes