Malicious PDF — malware analysis report

Static analysis result for SHA-256 a834cddfde13927e…

MALICIOUS

PDF

39.7 KB Created: 2020-04-09 06:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6b1ace9d344c7d2d2d53116164d5a58b SHA-1: 26898f7bebdb6ca5dbfaa22b72e0ac8c32767054 SHA-256: a834cddfde13927e35f6e9e6894ff39026069d795ffcb455ea483c967196fa2e
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links to various domains, a technique often used for SEO link farming or to distribute malicious content. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior. The embedded URLs point to PDF files with numeric slugs, further supporting the link farm hypothesis. The document body itself is largely obfuscated but contains one of the URLs, indicating it's part of the lure.

Heuristics 3

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://tartelaine.com/uploads/1/3/0/9/130969485/130969485.html#cuantos+ml+tiene+un+litro+de+agua
    • http://olihomesolutions.us/uploads/1/3/1/3/131380730/187b1656b426b.pdf
    • http://incubatinginspiration.com/uploads/1/3/0/2/130287936/fb6defb31ffd.pdf
    • http://comfycribs.com/uploads/1/3/1/3/131383621/zamuwaworediwen_xosexapad_jejozowamaro.pdf
    • http://purplepongo.com/uploads/1/3/0/2/130289620/9067fb448.pdf
    • http://labellaristorantelees.co.uk/uploads/1/3/0/4/130489727/2206401948.pdf
    • http://foreverdiamondsandmoresj.com/uploads/1/3/0/6/130621656/kukujolubekipotef.pdf
    • http://suiletech.com/uploads/1/3/0/2/130272233/didosef.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_off0000634d.bin
13a77c1e30fbd9bf22402e5fd8a58296370d77197bb007d0f5bd7f667ec3536b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x634D 8904 bytes
font_01_sfnt_off00008366.bin
885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8366 4144 bytes

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