Malicious PDF — malware analysis report

Static analysis result for SHA-256 b938c8352c6761a2…

MALICIOUS

PDF

44.5 KB Created: 2020-08-14 01:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a714bd225ccc33d107a2301eea2c64a2 SHA-1: c73b5b53ba98d0a128a5273f87cd1c57a9e7c7cc SHA-256: b938c8352c6761a2ca3d05de664ae6083bedc06f3d24c33028d14342d5201128
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com) that is known to host malicious content. The document body, though heavily obfuscated, contains text related to a "medical examination form for canada immigration", suggesting a social engineering lure. The presence of numerous links, including those to benign Shopify domains and other unknown domains, indicates a link farm designed to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=medical+examination+form+for+canada+immigration
    • http://files.nanolab.info/uploads/1/3/1/3/131379749/befuraxigufero.pdf
    • http://files.lewisrawlinson.com/uploads/1/3/0/7/130775649/9ef022b4c4a735.pdf
    • http://dolotuzok.dangwaflorist.com/uploads/1/3/1/6/131606227/vinevotokok-modosubijudo-rolaw.pdf
    • http://files.kulmschool.com/uploads/1/3/1/3/131398177/tupegusateke-fovape-jazak.pdf
    • http://gowufo.palaciosviolin.com/uploads/1/3/1/0/131071157/b59130.pdf
    • https://cdn.shopify.com/s/files/1/0434/0911/3253/files/73542062428.pdf
    • https://cdn.shopify.com/s/files/1/0440/2138/3333/files/cursive_writing_file.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9079/files/95801134640.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/44292972139.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/8196007881.pdf
    • https://cdn.shopify.com/s/files/1/0437/9131/9200/files/93846315983.pdf
    • https://cdn.shopify.com/s/files/1/0430/6855/5415/files/levizafop.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/rawosok.pdf
    • https://cdn.shopify.com/s/files/1/0435/6413/8651/files/tafseer_al_bayan.pdf
    • https://cdn.shopify.com/s/files/1/0430/1206/3391/files/acceptance_and_commitment_therapy_hayes_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/callese_y_venda_gratis.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_off00007098.bin
3ca145c091296d3d2e5580ff6623d786b913b808525ed1e854838d999b7ac8bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7098 5236 bytes
font_01_sfnt_off0000825e.bin
5d9a963c976cab4684e2072ff09f1e44fd0aa5d2589dbed78f7a9effcdf55055
pdf-font-stream PDF embedded font (sfnt) at offset 0x825E 10144 bytes