Malicious PDF — malware analysis report

Static analysis result for SHA-256 443a8b9493e55fc4…

MALICIOUS

PDF

41.6 KB Created: 2020-08-09 19:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0aa0fb7a747853a2e02c81e9c453f8f SHA-1: ccd00c2ef918fcd61c54fd6a1aad05885ed8a6b1 SHA-256: 443a8b9493e55fc4f425576bedb2c6684a217590bb4a46f4b4a5d339c2ea9882
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, 'https://ttraff.cc/pify?keyword=abelardo+castillo+cuentos+completos+pdf', which is designed to lure users to malicious infrastructure. The document body text, though partially corrupted, includes the same book title used in the redirector URL, suggesting a social engineering pretext. 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=abelardo+castillo+cuentos+completos+pdf
    • http://files.frederickcitybaberuth.com/uploads/1/3/0/7/130775850/2e8250def36f7e.pdf
    • http://files.mindfulprofits.com/uploads/1/3/1/4/131452804/rakapesokakute_zunuzufulusime_levogeb.pdf
    • http://files.suewestcott.com/uploads/1/3/1/3/131383949/jexarulor_xugonajuz_woxidewetoba_xofasubonune.pdf
    • https://cdn.shopify.com/s/files/1/0430/9126/3649/files/suvuworefotozenuzo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/gusevagabagedufanixega.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4549/files/50532389259.pdf
    • https://cdn.shopify.com/s/files/1/0433/6353/2951/files/numeros_romanos_del_1_al_1000_completos_en.pdf
    • https://cdn.shopify.com/s/files/1/0429/7709/9935/files/569054019.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/cambios_psicosociales_en_el_adulto_mayor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92702877098.pdf
    • https://cdn.shopify.com/s/files/1/0429/0691/0887/files/59726009201.pdf
    • https://cdn.shopify.com/s/files/1/0432/8456/2086/files/64638058385.pdf
    • https://cdn.shopify.com/s/files/1/0428/8321/9619/files/96224299404.pdf
    • https://cdn.shopify.com/s/files/1/0433/4505/1797/files/24640185377.pdf
    • https://cdn.shopify.com/s/files/1/0436/0978/4482/files/91441878140.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_off000060b7.bin
a3ea4ae7ef7fa801da85f56b71768a82248671f5dafa35ca7b318c8112519fb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B7 5432 bytes
font_01_sfnt_off00007311.bin
4b3154d0f216ccee40740d5837816e8587e8c8ab715915dcbf3ba8386981a12c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7311 11164 bytes

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