Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e2f6bc24835d855…

MALICIOUS

PDF

40.8 KB Created: 2020-08-31 18:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fa7a3421db0446571bdca0349ea6745 SHA-1: 5c34e9c01358daa84588a9f7271cbfe3b3c2d4d9 SHA-256: 2e2f6bc24835d85513f9cf03bad6dc9e770805097d81da648e428f8624bdb644
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/wix?keyword=fusionner+des+pdf+avec+adobe+reader', is designed to lure users into clicking it under the pretext of merging PDF files. The presence of a large number of external links, many pointing to Shopify-hosted PDFs, suggests a link farm or SEO poisoning tactic to distribute the malicious URL. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wix?keyword=fusionner+des+pdf+avec+adobe+reader
    • https://static.usrfiles.com/ugd/a18aa6_9576cee1a52646eb966c3ffc7f5afaca.pdf
    • https://static.usrfiles.com/ugd/9374a7_1e5d6b66ca7542cf82d248560e5f9324.pdf
    • https://static.usrfiles.com/ugd/a382ee_645748346aaf47529ec93e265884f35b.pdf
    • https://static.usrfiles.com/ugd/eaf48f_348c1eee8b3547129c7e74149a84f77f.pdf
    • https://static.usrfiles.com/ugd/b77b08_a21969bda6d44b26acde7352823e5ea7.pdf
    • https://cdn.shopify.com/s/files/1/0436/6204/9433/files/gologexevejavujobujivozaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/5560/3094/files/20912219758.pdf
    • https://cdn.shopify.com/s/files/1/0433/6897/2444/files/redaximavof.pdf
    • https://cdn.shopify.com/s/files/1/0433/4118/5189/files/39467323728.pdf
    • https://cdn.shopify.com/s/files/1/0434/0544/3233/files/31512953454.pdf
    • https://cdn.shopify.com/s/files/1/0437/7876/9045/files/structural_steel_design_mccormac.pdf
    • https://cdn.shopify.com/s/files/1/0439/4260/9051/files/tadugexejiwebew.pdf
    • https://cdn.shopify.com/s/files/1/0438/3758/7606/files/pdf_marketing_management_notes.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/
    • https://cdn.shopify.com/s/files/1/0438/3758/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f12.bin
8e26ef9508bd5dabd2f785a30a600c880ec154ead394cd0d635c9f3dac4547e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F12 5272 bytes
font_01_sfnt_off00007113.bin
82fb8b076a4f1aa66770d5718b95907dd158f0fde91b7ffd2c2f764d821f1c97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7113 11600 bytes

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