Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8391d5b22697c61…

MALICIOUS

PDF

38.4 KB Created: 2020-08-06 09:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b3f119ff584ee55a20c9f930c31383b SHA-1: ae7c6106a057e806fbb9e20d5660d0e00d648a73 SHA-256: b8391d5b22697c612c75ce2d48be0bf3ea2d369e0617fa42c593d2960672e1ef
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 benign content on Shopify, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This suggests a phishing or scam attempt, using a seemingly relevant topic like the 'US national electrical code pdf' to entice clicks. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector is a strong indicator of malicious intent.

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=us%20national%20electrical%20code%20pdf
    • http://files.ladandp.com/uploads/1/3/1/4/131453665/xebirilidoduruk.pdf
    • http://files.midwestfarmandpet.com/uploads/1/3/1/3/131398221/21a0b0.pdf
    • http://files.thesloecook.co.uk/uploads/1/3/1/6/131606331/wedafumuturep.pdf
    • https://cdn.shopify.com/s/files/1/0432/7522/3206/files/discord_webhook_example.pdf
    • https://cdn.shopify.com/s/files/1/0436/5054/7870/files/real_estate_assignment_agreement.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/5538503211.pdf
    • https://cdn.shopify.com/s/files/1/0432/3128/1314/files/55248526311.pdf
    • https://cdn.shopify.com/s/files/1/0429/8034/3967/files/sepsis_pathophysiology_and_clinical_management.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/linoxi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1721/4874/files/ubuntu_14._04_sources._list.pdf
    • https://cdn.shopify.com/s/files/1/0434/7310/9152/files/32658624277.pdf
    • https://cdn.shopify.com/s/files/1/0451/3621/6229/files/how_do_i_get_github_io.pdf
    • https://cdn.shopify.com/s/files/1/0432/3174/0071/files/quicksort_c_code.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/xigepogulel.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5502/files/68921681609.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_off000059ed.bin
845a7dce5346c6c0e1d9b5fa38b072fb61269397688747f6d1ca0647a03a42f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59ED 5140 bytes
font_01_sfnt_off00006b7c.bin
bf54ff6995a0a71bf4115c96602f888631d3964b4d790d63727882204dbb5bef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7C 9676 bytes

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