Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbef52edc16c1bf…

MALICIOUS

PDF

43.9 KB Created: 2020-08-30 20:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad50ba2fd2938a35470703faac455d0b SHA-1: 53743b52ce89194bca9e229a0d80ecd0bb81e456 SHA-256: bcbef52edc16c1bf5fe6a0d40bb9be52af6e2fbba78c30ff4bf29af0f2d7c74b
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the target URL. The presence of a large number of embedded links to other PDFs suggests a link farm or SEO poisoning tactic to obscure the malicious redirector.

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.com/wix?keyword=legend+of+the+boneknapper+dragon+dow
    • https://static.usrfiles.com/ugd/b8c837_2abd62b14c8a499595e537b6201fa228.pdf
    • https://static.usrfiles.com/ugd/ca300b_cc877de51a924b46affb76e0cd532d1c.pdf
    • https://static.usrfiles.com/ugd/9cb927_6fe6ebb32f4440dfa3472957ef49fb21.pdf
    • https://cdn.shopify.com/s/files/1/0430/0315/0499/files/69428086057.pdf
    • https://cdn.shopify.com/s/files/1/0437/6988/8920/files/bugdom_2_mac.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pufabupenidobuxix.pdf
    • https://static.usrfiles.com/ugd/24853a_36e55604170042ebae2330828edf7466.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a4f14071a4c426f88c4eb5238b1e70f.pdf
    • https://cdn.shopify.com/s/files/1/0436/3101/8142/files/weduligotatewu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7929/5383/files/85104708595.pdf
    • https://cdn.shopify.com/s/files/1/0434/5842/9078/files/css_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/3620/3415/files/nofudotizopevitexonori.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6341/files/sutojawufodegamafolevomok.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_off00006e80.bin
98f1fa5ce92ad5896d9aa4dcc44c2933f9e8921c3a61ff3f340bbf898776e894		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E80 5332 bytes
font_01_sfnt_off000080b6.bin
996267c9fc3c8b0bf8db75fa056a1cb6cd2bf102a1ff84640d8f10f048bd3448		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80B6 9956 bytes

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