Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecca65f5a9a9a3c…

MALICIOUS

PDF

39.0 KB Created: 2020-09-02 07:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b16b2d6392d94fd8464cc7dc838013a3 SHA-1: 2250ffe2d4d25a8506a0778a450d318f01a4e171 SHA-256: 4ecca65f5a9a9a3c382da24878fcc30060f0d3b25ed2eaa086ae453f60ded349
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.me, which is disguised with keywords related to HMRC intermediary report deadlines. This suggests a phishing or social engineering attack. The PDF also contains a large number of external links, many pointing to static.usrfiles.com, indicating a link farm strategy. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.me/wix?keyword=hmrc+intermediary+report+deadlines
    • https://static.usrfiles.com/ugd/ef7b09_25c83391d95247969e226028d277d139.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e02d159814f48ccad7b6ad8e4ef7be0.pdf
    • https://static.usrfiles.com/ugd/b8c837_39e4fce23e094c38b95c59222cf2cbd7.pdf
    • https://static.usrfiles.com/ugd/89c6ad_624174d5159f4fba804abf3844a0511c.pdf
    • https://cdn.shopify.com/s/files/1/0436/0149/4179/files/einaudi_experience_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/8905/9228/files/95401460383.pdf
    • https://static.usrfiles.com/ugd/9734e7_39f38ab69ff1448e8e99c13556b59334.pdf
    • https://static.usrfiles.com/ugd/b8c837_fde0e5f9ecf94f0f8fa19f126ef7d74a.pdf
    • https://static.usrfiles.com/ugd/e02969_2d54dd7365ce433c8b444991788f9e79.pdf
    • https://static.usrfiles.com/ugd/3f8d85_6f43850bddbc42ae9f20650bc9f4e71d.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf567948d778449dadfef72b0fab2175.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_off000059da.bin
96389698a5e5e8b77c55acc8432afc128f23cc6103373a0f328dde9e55bd4886		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59DA 5280 bytes
font_01_sfnt_off00006bbb.bin
2d618997e4be1a6d3085e314097fb9d96c9103a179521dd541c2642cfe2ea4a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBB 10540 bytes

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