Malicious PDF — malware analysis report

Static analysis result for SHA-256 233ef1cac9b0d44f…

MALICIOUS

PDF

41.1 KB Created: 2020-08-30 03:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5252b6d861bdfd4722f0ddaf9758ea3 SHA-1: 47d40e4bca863e934f34053bfb21c95ad5f86bdc SHA-256: 233ef1cac9b0d44f1ed2a045fd72127e75af07da561db87588117e309c6ea5fc
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, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, many pointing to Shopify domains, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=rudolf+erdel+jewelry
    • https://static.usrfiles.com/ugd/b8c837_fa3f79f315344e1b9542d8b04c15f966.pdf
    • https://static.usrfiles.com/ugd/a771bd_f83aaa480eba4e54b67e11268411c276.pdf
    • https://static.usrfiles.com/ugd/1b8612_cdb9a17f13fc4226a2b00c7eb73122a3.pdf
    • https://cdn.shopify.com/s/files/1/0440/8839/3893/files/lemon_ktv_karaoke_software_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/8632/2600/files/mezuxopiwifefitagij.pdf
    • https://cdn.shopify.com/s/files/1/0434/0826/1287/files/effects_of_noise_reading_answers_mini_ielts.pdf
    • https://cdn.shopify.com/s/files/1/0437/5419/3047/files/wow_vanilla_grinding_spots.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5637/files/dietrich_bonhoeffer_biography.pdf
    • https://cdn.shopify.com/s/files/1/0461/8246/5689/files/dojewudisowaze.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/96128529461.pdf
    • https://cdn.shopify.com/s/files/1/0432/7679/6057/files/5733674025.pdf
    • https://cdn.shopify.com/s/files/1/0433/6173/0719/files/85467549696.pdf
    • https://static.usrfiles.com/ugd/b8c837_5453d015b399436893caff5cc32ab263.pdf
    • https://static.usrfiles.com/ugd/9ec29b_63c2cb7c9b9e4899ab24aa4575fc3e2e.pdf
    • https://static.usrfiles.com/ugd/3b47cb_206f7b2c07ba44ab8f5ad4e1494691e7.pdf
    • https://static.usrfiles.com/ugd/405339_79ad7c9b86c144a481d043a468f86bd8.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_off000063ad.bin
9a0ecce1bbe08b80f9eaf7ac48c192c0abbc494f1665428cb90f7150663eba1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63AD 4788 bytes
font_01_sfnt_off0000741f.bin
20525ed48f7e3744e624337256c6b370ad6071199e89093cca90e85629701d71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741F 10600 bytes

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