Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd314c8c4efc483…

MALICIOUS

PDF

50.0 KB Created: 2020-07-28 21:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6da974ff48dc215181aac21758a058fc SHA-1: 88b9fb67c0f8d3d562c6cd2adb4e84d8b273d05f SHA-256: efd314c8c4efc48360657ad03077fa43fe36b4e44cee76608849ac639178e456
120 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.cc, which is disguised as 'grade 1 math worksheets problem solving'. This suggests a phishing or scam attempt. The PDF also hosts a large number of external links, many pointing to Shopify domains, likely as part of an SEO link farm to obscure the malicious redirector. No scripts were extracted, and the document body was heavily obfuscated.

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.cc/pify?keyword=grade+1+math+worksheets+problem+solving
    • http://files.thehumanempathyproject.com/uploads/1/3/1/4/131454034/vobuxugani.pdf
    • http://files.umicad.com/uploads/1/3/1/6/131637546/dujasesetoreda.pdf
    • http://files.matthewarcher.net/uploads/1/3/1/0/131069887/xurorinufaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/2890/5127/files/fubumuw.pdf
    • https://cdn.shopify.com/s/files/1/0436/7951/4777/files/xakokexa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0684/4315/files/bulavup.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66541571973.pdf
    • https://cdn.shopify.com/s/files/1/0432/3439/4276/files/79801209205.pdf
    • https://cdn.shopify.com/s/files/1/0440/2115/3957/files/mopaxevoluluvoboxagizi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/tanosodesuxuwifesasapegit.pdf
    • https://cdn.shopify.com/s/files/1/0439/2475/0491/files/90237465054.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83759083977.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5280/files/jedutoderutowezawazusa.pdf
    • https://cdn.shopify.com/s/files/1/0434/3955/4727/files/pudop.pdf
    • https://cdn.shopify.com/s/files/1/0429/0111/0940/files/tarebepalulituledanatew.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/41426105165.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_off00008384.bin
fe49a17f646608d3a566130af95ba641fb46f8c8a8f0e2266efc840f5637f120		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8384 5600 bytes
font_01_sfnt_off00009684.bin
493673e46315bc673685cf8aa6b346542cf92853a72e8b014cce08af3e9c8c82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9684 10532 bytes

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