Malicious PDF — malware analysis report

Static analysis result for SHA-256 349306b1ac8508f2…

MALICIOUS

PDF

44.5 KB Created: 2020-08-24 09:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b53568ebd6722400c5a245498ca435fb SHA-1: 0b2c0be3a151b51c04461d33ca4f01b2976e46a0 SHA-256: 349306b1ac8508f2bf1e0be1a3cdf3295b00e8e8635a8f1af8012327bcce90ec
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains references to 'content marketing pdf' and includes the suspicious URL https://ttraff.ru/pify?keyword=definition+of+content+marketing+pdf. The presence of a link farm and the ML classifier's high confidence score further support the malicious classification. No scripts were extracted from this sample.

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/pify?keyword=definition+of+content+marketing+pdf
    • http://files.woodlandtechnology.org/uploads/1/3/1/3/131379268/sedijosumifumitiv.pdf
    • http://kolab.bna-stlouis.org/uploads/1/3/0/8/130814310/81071.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2919/files/wiwese.pdf
    • https://cdn.shopify.com/s/files/1/0445/1778/5759/files/65930933192.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3591/files/35502292236.pdf
    • https://cdn.shopify.com/s/files/1/0437/5173/5448/files/jufavalidozegigakunu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/bootstrap_mega_menu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/sodexuw.pdf
    • https://cdn.shopify.com/s/files/1/0439/4015/1454/files/kibexarezituvezuxolu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jaled.pdf
    • https://cdn.shopify.com/s/files/1/0435/4270/8378/files/pijikugutizekukudifez.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_off00006f9b.bin
c0cd42e3c84ae1ecff7b8d06188f30ef99f75abd8837410126c0025756fb3ef2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9B 5328 bytes
font_01_sfnt_off000081a4.bin
c08c3683b4a90c396cd4ccaff569860378f6ccde63c4d2db5a5e031e619e203a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81A4 10588 bytes

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