Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd43cbf734c21b36…

MALICIOUS

PDF

52.8 KB Created: 2020-08-04 14:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5fbbb3634a7f33663c02f783e26f914 SHA-1: 3c6a6d448ff80413b6e0f4025bd6b21b57848ff1 SHA-256: cd43cbf734c21b3653c06345f0efa2175f942ca58d85dd89ae31610230c05a74
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is 'https://ttraff.cc/pify?keyword=alfonso+reyes+la+cena+pdf', which is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains references to the malicious URL and other URLs hosted on Shopify, suggesting a link farm or redirection strategy. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=alfonso+reyes+la+cena+pdf
    • http://files.campstar.org/uploads/1/3/1/6/131606407/5765772.pdf
    • http://files.zacjolliffe.com/uploads/1/3/1/4/131454345/vagakisipinex.pdf
    • http://files.joh4autism.org/uploads/1/3/2/6/132681080/293d870.pdf
    • https://cdn.shopify.com/s/files/1/0431/6194/4228/files/61974906422.pdf
    • https://cdn.shopify.com/s/files/1/0433/0618/8955/files/nutigenajapukerosidisewig.pdf
    • https://cdn.shopify.com/s/files/1/0432/4232/4125/files/merge_sort_c_code.pdf
    • https://cdn.shopify.com/s/files/1/0439/2786/3464/files/best_legendaries_for_ret_paladin.pdf
    • https://cdn.shopify.com/s/files/1/0432/5077/8275/files/deterioration_of_concrete.pdf
    • https://cdn.shopify.com/s/files/1/0435/9448/1823/files/67512250408.pdf
    • https://cdn.shopify.com/s/files/1/0433/4675/5734/files/77753768519.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34680977850.pdf
    • https://cdn.shopify.com/s/files/1/0438/5056/3734/files/xekaseki.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/zovokexeviturapapezopiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/5581/5583/files/12716365180.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_off000090b9.bin
2b3df51d3dcf8e3c2809696af6711ba3e01b703fc4947358ad63f7d4fa503878		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90B9 5240 bytes
font_01_sfnt_off0000a2ab.bin
7a6c69c05ae892bcf59be95db8b34761796adee995f08c22ff917eb89c7bfac1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2AB 10580 bytes

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