Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd5e3e82dd6e7c8…

MALICIOUS

PDF

35.1 KB Created: 2020-08-07 08:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a435a454e64108a23c90e1fa9f2fa625 SHA-1: f8d28ec2ad596a80fbefde760f79663b386e580f SHA-256: efd5e3e82dd6e7c828c07fb9146cddfd7d1455be0b6d179bd4dfaae533b3a9de
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to ttraff.com. The document body, though heavily obfuscated, contains the same URL and mentions 'note reading pdf', suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy to obscure the malicious redirector. No scripts were extracted from this sample.

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.com/pify?keyword=treble+clef+note+reading+pdf
    • http://logovunas.juliankazenas.com/uploads/1/3/2/7/132741334/8701815.pdf
    • http://jimikav.kadencekreations.com/uploads/1/3/1/0/131070450/8177251.pdf
    • http://files.atonementrochester.org/uploads/1/3/1/4/131438616/dapuvumofukak.pdf
    • https://cdn.shopify.com/s/files/1/0431/8176/8864/files/41529306160.pdf
    • https://cdn.shopify.com/s/files/1/0435/7799/9519/files/61454144539.pdf
    • https://cdn.shopify.com/s/files/1/0431/6649/8965/files/mipimabuginexurubutu.pdf
    • https://cdn.shopify.com/s/files/1/0438/9722/5368/files/vawalu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7411/7018/files/zelda_minish_cap_rom.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/43441200314.pdf
    • https://cdn.shopify.com/s/files/1/0436/4235/5865/files/44914955104.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/devulujidabipib.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/potufi.pdf
    • https://cdn.shopify.com/s/files/1/0438/9850/3336/files/28666147894.pdf
    • https://cdn.shopify.com/s/files/1/0430/6714/6397/files/57466491463.pdf
    • https://cdn.shopify.com/s/files/1/0433/2853/6734/files/nebogajod.pdf
    • https://cdn.shopify.com/s/files/1/0429/0553/4620/files/76048492568.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_off00004cc2.bin
94d8e0244e53c8f93c0c967133bdfc508ab9627dc0f6fdc5da2e04df02e1407f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CC2 5232 bytes
font_01_sfnt_off00005e9f.bin
c75156bfecbba2beee7c71d3dbc775c9518e82f2a8d3cafd32dda7a9ca9a1445		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9F 9772 bytes

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