Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86c5992dbb23904…

MALICIOUS

PDF

48.7 KB Created: 2020-08-22 23:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d988c60c125e59da6ce93e8b5e07577 SHA-1: d1cba6cada8803f325a6bf5d09a1af42443d17aa SHA-256: b86c5992dbb23904cc5bca4fb614d2554647d4e4028dee1390b373eaf7a604e9
150 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=define+damask+cotton+sheets'. This indicates an attempt to redirect the user to a malicious site. The document body, though heavily obfuscated, also contains this URL and numerous other links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=define+damask+cotton+sheets
    • http://files.memorybengesa.org/uploads/1/3/1/8/131871740/judaxugavuwapasupibe.pdf
    • http://files.whippetclubofscotland.co.uk/uploads/1/3/1/4/131408664/e0a846.pdf
    • http://files.theartgalleryatgcc.com/uploads/1/3/0/7/130738693/3580331.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/wanting_memories_satb.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8019/files/ap_sachivalayam_notification_2019.pdf
    • https://cdn.shopify.com/s/files/1/0434/4093/0983/files/angular_template_admin_pro.pdf
    • https://cdn.shopify.com/s/files/1/0428/7053/8406/files/59895136821.pdf
    • https://cdn.shopify.com/s/files/1/0430/4565/0586/files/gifona.pdf
    • https://cdn.shopify.com/s/files/1/0430/2831/6313/files/gozutezu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/14442000909.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6636/files/4772103508.pdf
    • https://cdn.shopify.com/s/files/1/0434/4951/6199/files/44467747913.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_off000069f9.bin
2784fcc7e4912f0e67fc0a8a4bc7d5d241dc0ecc647a3237be2ee0e01491052e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F9 5196 bytes
font_01_sfnt_off00007b8b.bin
81f9850c1f17e9da776bfcc733c0ad079f7c971188784ae0c1ca7011fbe91bb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8B 10300 bytes
font_02_sfnt_off00009ef2.bin
841d7d791da54294f27c5680b7d9c9a4225c25346fdd5282ce41076c705b6f36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EF2 16692 bytes

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