Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffa7aa9b0a2ba20…

MALICIOUS

PDF

36.0 KB Created: 2020-09-02 00:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b70cac544778276d83d3fd092168605b SHA-1: 3fed855e26f4425ff88f0bdbb6b460039cc4911b SHA-256: 4ffa7aa9b0a2ba20e40165e89d9baaaa0da463d5eef89f57bf3a30a4de666bf7
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. This URL is embedded within the document body, which also contains a large number of other links to Shopify-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL.

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/wix?keyword=punctuation+worksheets+4th+grade+pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7448/files/54560525752.pdf
    • https://cdn.shopify.com/s/files/1/0433/9036/9959/files/canon_pixma_ip100_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/vomoxexafesabutozu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/49197818858.pdf
    • https://cdn.shopify.com/s/files/1/0435/5178/5109/files/goxuzikejebifa.pdf
    • https://cdn.shopify.com/s/files/1/0437/4947/4453/files/97074870216.pdf
    • https://cdn.shopify.com/s/files/1/0429/7005/4805/files/leon_orthographe_cm1.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/12158465248.pdf
    • https://cdn.shopify.com/s/files/1/0431/3533/6605/files/18986644721.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/25808433988.pdf
    • https://cdn.shopify.com/s/files/1/0428/2092/7644/files/answer_sheet_sample_for_9th_class.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_off00004d89.bin
6b5b6e4c056b3f57a1debe3db4634a1e03ee680ed9f0cf3234ee09cba7b3fb4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D89 5632 bytes
font_01_sfnt_off000060d5.bin
caf35c8cfd796a037d446457752458b35b5f23fcc80f46cfe9e5c17e69fecdee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D5 10316 bytes

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