Malicious PDF — malware analysis report

Static analysis result for SHA-256 db666546a1afd820…

MALICIOUS

PDF

58.6 KB Created: 2020-08-15 01:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aff9d25d2b1f49950c8b49d521eb7c2a SHA-1: 558e78b03a51ce9396f28707b1dce07eff1933aa SHA-256: db666546a1afd820568e27c2947e19f2fb76fcc71aa049f22256abbc24ff29c9
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru', which is disguised with a search query for educational materials. The document body, though partially corrupted, includes the same deceptive title and the malicious URL. The presence of numerous embedded links, many pointing to Shopify, suggests a link farm or SEO poisoning tactic to increase visibility and lure victims. The ML classifier strongly indicates maliciousness.

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.ru/pify?keyword=marshall+cavendish+singapore+math+answers+grade+4
    • http://kokazod.araiacademy.com/uploads/1/3/0/7/130739059/4689.pdf
    • https://cdn.shopify.com/s/files/1/0433/6045/2760/files/xebuvavuwumamoj.pdf
    • https://cdn.shopify.com/s/files/1/0438/2726/5693/files/71226091443.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/fg_knot_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2938/files/51448862763.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/26791487798.pdf
    • https://cdn.shopify.com/s/files/1/0433/1352/8987/files/estimation_and_costing_in_civil_engineering_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0437/3214/0186/files/convert_html_to_laravel_5._5.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/64271751075.pdf
    • https://cdn.shopify.com/s/files/1/0448/0552/1559/files/apartment_ownership_act.pdf
    • https://cdn.shopify.com/s/files/1/0454/7146/5624/files/christmas_carols_choir.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8188/files/ggplot2_volcano_plot.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_off00009606.bin
f0f6be8d4f90339c49b75ff16760c6631cb07df21ca64417fe3aca28c5812451		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9606 5520 bytes
font_01_sfnt_off0000a8b8.bin
47216f34cbff7e3c2b8cf1a592ccf89c2af8b6759fc4b6a54f75d72506ae95a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8B8 10844 bytes
font_02_sfnt_off0000cd56.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD56 4324 bytes

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