Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b492fbee82aa7f…

MALICIOUS

PDF

42.0 KB Created: 2020-09-18 12:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da90194921ffffd1e9fb95f97ade2678 SHA-1: 9f744ccdff5acdde312e0b28b7b55bd7009269ec SHA-256: f2b492fbee82aa7fe0f5fd1df3d57f191c73589f25362a4fab61151274d58531
128 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically `https://ttraff.link/wix?keyword=biology+photosynthesis+pogil+answer+key`. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links pointing to external PDF files, such as `http://gonapinu.leadingedgeequine.com/uploads/1/3/2/6/132680835/9241252.pdf`. The presence of a 'download button' lure further supports the malicious intent of directing users to potentially harmful content.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=biology+photosynthesis+pogil+answer+key
    • http://gonapinu.leadingedgeequine.com/uploads/1/3/2/6/132680835/9241252.pdf
    • http://lapofis.tripletkennelsarkansas.com/uploads/1/3/1/4/131437987/0ccf0a07e713e4.pdf
    • http://files.gay-lesbian-retreats.com/uploads/1/3/2/6/132696018/vofugerepamosen-fupawejewuvizuf-feruvaf.pdf
    • https://246668b4-e5a2-4a8a-84e3-2a04b1085e82.filesusr.com/ugd/2f3216_d095b4a077fc41ce89543e65759cc563.pdf?index=true
    • https://a90026b8-60f8-45ed-91c3-7ed7480d6993.filesusr.com/ugd/9c58c5_78302ba0452c479f9fc4f0c7a1823b4d.pdf?index=true
    • https://6e3bfc8b-0fd6-4a25-99e0-97475bab3943.filesusr.com/ugd/362633_8de207e016ac4d0da72cf9d107544665.pdf?index=true
    • https://06f04161-34fa-4bd5-947a-d32bb370ae2f.filesusr.com/ugd/3b0c81_fec18800e4c64ab196d3444fff8879ae.pdf?index=true
    • https://d91457d6-a929-4d89-aced-7f5f0d012ecb.filesusr.com/ugd/54dfea_9b22e54e9fa043f4a541d03b7f9a0a86.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0439/9782/3134/files/16910332271.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/63653719525.pdf
    • https://cdn.shopify.com/s/files/1/0433/6405/7238/files/99718284276.pdf
    • https://cdn.shopify.com/s/files/1/0436/0860/4829/files/bukexinekabuxokateruju.pdf
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/65641955070.pdf
    • https://cdn.shopify.com/s/files/1/0434/0698/3333/files/wipijise.pdf
    • https://cdn.shopify.com/s/files/1/0431/9730/0885/files/applications_of_partial_differential_equations_in_real_life.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005670.bin
2b5dd22df9c4bd7a11542b859208dc3cf0bfa5b46c9e15f89e2b8a1bca40b7bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5670 5176 bytes
font_01_sfnt_off00006810.bin
6a65a2df800962f84a086f8c3fe2329e585a200fa67b5c42754d13cab1e287d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6810 10856 bytes
font_02_sfnt_off00008d09.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D09 4324 bytes

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