Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0fb41dd302e83c9…

MALICIOUS

PDF

90.9 KB Created: 2020-08-14 10:38:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8e48f6aaec54c5059e57c520297635c SHA-1: 6ca87181e01cbd3ab1f45bddca4067d1d7c8be58 SHA-256: d0fb41dd302e83c92ed9d7240be7156e1732a2f43b35c2a06f912275e7bf6782
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/wb?keyword=lorenzo's%20oil%20movie%20questions%20worksheet%20answers'. The document body, though heavily obfuscated, contains a reference to this URL, indicating the primary intent is to redirect the user to a malicious site.

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/wb?keyword=lorenzo
    • http://zejalut.hylandgroup.com/uploads/1/3/0/8/130874493/69eef.pdf
    • http://files.fernleyrepublicanwomen.com/uploads/1/3/1/4/131453284/9980529.pdf
    • http://kubul.paphos-dog-training.com/uploads/1/3/0/7/130738970/fd745d.pdf
    • http://files.englewoodpilates.com/uploads/1/3/2/6/132681482/wakote_bononameba_womafivudawen_venekefub.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5270/files/sovifofogo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7720/6178/files/nutrition_word_search_puzzle_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0435/4749/2506/files/7764796444.pdf
    • https://cdn.shopify.com/s/files/1/0439/4595/1400/files/tetebinoxafewabevo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1483/8679/files/21994129543.pdf
    • https://cdn.shopify.com/s/files/1/0429/6078/1465/files/sinafoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/5580/7641/files/basic_accounting_journal_entries.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8472/files/vasepogelareb.pdf
    • https://cdn.shopify.com/s/files/1/0429/0890/9734/files/editing_documents_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0433/3171/5225/files/98448739447.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5966/files/english_grammar_in_use_elementary_level_test.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_off00012813.bin
76c29ae46845e26eb5ad14df0cc4ca63d7216cc106710c9fa63a24d5db781da3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12813 5292 bytes
font_01_sfnt_off00013a0e.bin
80a15046541980aaae002e54115569c76b1cf406ff11dc2742703058ab09a901		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0E 10592 bytes

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