Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cb408a621c54d8…

MALICIOUS

PDF

40.2 KB Created: 2020-08-19 17:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8303951c0cf380aeaa9a66895243405d SHA-1: 9f987cbd3a237687cb8b1eedd81e4451490aed0c SHA-256: 45cb408a621c54d86173a65af85504cfe5d984e3d6db813cf543e7144ea3ae30
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious infrastructure at ttraff.ru. This suggests a link farm or redirection tactic to obscure the ultimate malicious destination. The document body, though heavily obfuscated, contains the text 'Bacterial brain abscess guidelines' and the malicious URL, indicating a lure to disguise the malicious intent. The primary attack pattern involves redirecting the user to malicious content via a link farm.

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=bacterial+brain+abscess+guidelines
    • http://files.saltandlightmin.org/uploads/1/3/1/0/131070588/8d02216607.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33078626275.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/94228434376.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4620/files/73824000088.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/allegra_comprimido_bula.pdf
    • https://cdn.shopify.com/s/files/1/0432/8688/8612/files/fikes.pdf
    • https://cdn.shopify.com/s/files/1/0430/8772/4704/files/fotepebumudovadojew.pdf
    • https://cdn.shopify.com/s/files/1/0437/7473/8586/files/biology_question_paper_2020_state_board.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/20616679111.pdf
    • https://cdn.shopify.com/s/files/1/0445/6952/6436/files/xikepuj.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/spin_to_win_wheel.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1669/files/38646556563.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_off000060f0.bin
06300615017eebef1cb499e2e5c4e1082d0875b0ee4dfecf60a1e9adba284cd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F0 5296 bytes
font_01_sfnt_off000072ef.bin
f5f12339f0b431c8589b296c8ecbee8b2b34d332f8128daa09076ef204e313ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72EF 9776 bytes

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