Malicious PDF — malware analysis report

Static analysis result for SHA-256 875e95c20905fb24…

MALICIOUS

PDF

38.5 KB Created: 2020-08-11 23:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d3f3b0d2ddce678dbf8bd9d9972cd12 SHA-1: e86ead1e4ae9f68bccb098caf1832447517bfd3e SHA-256: 875e95c20905fb24d901a27243be636d1d8d6a7038aea976897458fe47c69ae3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to a malicious URL, masquerading as a free PDF to Word converter. This is supported by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the embedded URL pointing to `https://ttraff.ru/pify?keyword=convertir+de+pdf+a+word+gratuito`. The PDF also contains a large number of links to other PDFs, suggesting a link farm for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=convertir+de+pdf+a+word+gratuito
    • http://files.vexsens.com/uploads/1/3/0/7/130775846/waforumuwanaxogudo.pdf
    • http://files.levusboutique.com/uploads/1/3/0/7/130775197/gasunojedurofuv.pdf
    • http://files.annessecrethangups.net/uploads/1/3/1/4/131453598/gemimopazemolodera.pdf
    • http://worakere.questalpacas.com/uploads/1/3/1/3/131398140/muxusajapibi-mikisoniwula-xejire-vuwugan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3480/2333/files/income_tax_assessment_year_2020_20.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/6783765488.pdf
    • https://cdn.shopify.com/s/files/1/0429/8814/2743/files/zoxovena.pdf
    • https://cdn.shopify.com/s/files/1/0431/7285/5967/files/artritis_reumatoidea_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0429/3296/1443/files/cardinal_sign_and_symptoms_of_heart_attack.pdf
    • https://cdn.shopify.com/s/files/1/0440/0853/8262/files/42249641315.pdf
    • https://cdn.shopify.com/s/files/1/0430/9739/1261/files/duneromepivusaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1028728638.pdf
    • https://cdn.shopify.com/s/files/1/0435/5411/1656/files/75758373623.pdf
    • https://cdn.shopify.com/s/files/1/0430/6278/8245/files/92936468745.pdf
    • https://cdn.shopify.com/s/files/1/0434/0980/1365/files/wekisesojetubawapareberu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/riginijulu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0942/5056/files/11431508296.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055fc.bin
a5eefffb94c8f73d3cceef10e36bfb08f6dee694b4c2f1f704d14a4bdc254c80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55FC 5056 bytes
font_01_sfnt_off00006751.bin
87d1a5eabf4392edc123318c30d23583252eaeafe2b26a04136ec7a831abc1de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6751 11416 bytes

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