Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a85c821d9f3a229…

MALICIOUS

PDF

58.4 KB Created: 2020-08-17 13:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91422fb12e77c3dc4f26b25bd8d52f05 SHA-1: 5297f22a390c7c098dde723c6faef7e4dba6edfd SHA-256: 3a85c821d9f3a2294d12fcf8152c63adb33876495d8bd1c7cbb33ad4d09221b2
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=leisure+time+reading+answer+mini+ielts'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one to 'https://cdn.shopify.com/s/files/1/0431/4277/4938/files/xilifu.pdf'. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing the malicious intent.

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/pify?keyword=leisure+time+reading+answer+mini+ielts
    • http://files.marriedmarks.com/uploads/1/3/2/8/132816158/wawezanuz-titun-resuta-ponupax.pdf
    • http://lixivaj.gaoruideus.com/uploads/1/3/0/8/130873867/ecda6482a7b.pdf
    • http://files.unidadepastoral.com/uploads/1/3/1/4/131437351/195585ef.pdf
    • http://files.easternshorechess.com/uploads/1/3/1/4/131483584/pekizureb_zabixi_mapof_menuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4938/files/xilifu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7405/9430/files/estatstica_aplicada_anlise_exploratria_de_dados.pdf
    • https://cdn.shopify.com/s/files/1/0430/4653/5322/files/34463993617.pdf
    • https://cdn.shopify.com/s/files/1/0431/4615/0039/files/rebulajisozosijavakevebe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6594/1917/files/7247203891.pdf
    • https://cdn.shopify.com/s/files/1/0433/8558/5820/files/80228551940.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinubigelezegir.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_off0000a708.bin
b8aea0e3a0426f8d3802b12d8ea90339c2c4b5b1bd33dc2d5ba0489b03de0bd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA708 5180 bytes
font_01_sfnt_off0000b899.bin
987477da23d86006c19d83222b9248890cb53ac03473b4e6b52e5b1f2244c59b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB899 10692 bytes

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