Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1a70f2d86af8f6…

MALICIOUS

PDF

39.6 KB Created: 2020-08-23 11:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b394180ee9b209e3398e6e4ed37e766 SHA-1: 7fa1f0ce936bb8b5ff5fd7262ae000d022d54732 SHA-256: 0c1a70f2d86af8f64f00918966c3174518fc4d61651f04c9939b080023e608cc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, classifying it as a link farm. One of the primary links directs to a known malicious redirector, 'ttraff.cc', which is likely used to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=cascading+style+sheet+document%2528.+css%2529
    • http://files.livinginrogerspark.com/uploads/1/3/0/7/130740391/bebimovevugij.pdf
    • http://poniti.toplinepriority.com/uploads/1/3/0/8/130814407/tadinirigesa.pdf
    • http://files.getmixedconcrete.co.uk/uploads/1/3/1/3/131379183/makazafeb_fibifo_gagatibolifuver_xilavelenonebog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/75515915706.pdf
    • https://cdn.shopify.com/s/files/1/0437/3164/8663/files/ansible_ad_hoc.pdf
    • https://cdn.shopify.com/s/files/1/0435/1092/3423/files/certificado_medico_legal.pdf
    • https://cdn.shopify.com/s/files/1/0429/9839/9139/files/gazebalepob.pdf
    • https://cdn.shopify.com/s/files/1/0439/1672/2344/files/burrakatha_in_telugu_naa_songs.pdf
    • https://cdn.shopify.com/s/files/1/0430/6557/3537/files/operatoria_dental_barrancos_3ra_edicion.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0687/files/50580299548.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7719/files/toyota_case_study.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3481/files/sidofixajaxujufekurugawod.pdf
    • https://cdn.shopify.com/s/files/1/0458/6419/0105/files/bimopifederonojexit.pdf
    • https://cdn.shopify.com/s/files/1/0434/7170/0120/files/house_rent_agreement_format_sample.pdf
    • https://cdn.shopify.com/s/files/1/0433/2116/3941/files/the_buddha_2010.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_off00005c5c.bin
e355edd48a8ee47d8b6e3396518b6a3df000f45fd8a486ea34fd21a4764338ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C5C 5448 bytes
font_01_sfnt_off00006ec7.bin
9bad8c16771335afed3e2bd8d330173668c2472e5f61a23ef62892aa552e21f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC7 10272 bytes