Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e9c75be77bdf973…

MALICIOUS

PDF

42.1 KB Created: 2020-08-07 23:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b35e87f8b08592115615f4e3f44401f1 SHA-1: 59040e3b6e57aad5b37c19a524c54abed3abbd64 SHA-256: 6e9c75be77bdf9735dfd719f6e1c6770b57f91df02b2992ff4457a6afb365211
162 Risk Score

Malware Insights

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

The PDF contains a mass link farm, with a primary malicious redirector URL identified. The document body, though obfuscated, contains the same malicious URL and appears to be a lure for medical-related content. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests an attempt to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=bronchopneumonia+in+pediatrics+pdf
    • http://files.soulesolsticefarm.com/uploads/1/3/1/8/131856135/3351041.pdf
    • http://files.shehrezadmaher.com/uploads/1/3/2/6/132681901/wumowosujaz.pdf
    • http://files.pwcyoga.com/uploads/1/3/0/7/130775490/nixezekixubudabom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8876/4316/files/2003_saturn_vue_owner_s_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6841/files/17242599552.pdf
    • https://cdn.shopify.com/s/files/1/0449/4403/1899/files/ap_calculus_derivatives.pdf
    • https://cdn.shopify.com/s/files/1/0439/4231/4152/files/namorado_de_aluguel_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/9348/2902/files/67428738098.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7658/files/92412941537.pdf
    • https://cdn.shopify.com/s/files/1/0431/9484/3293/files/4250823420.pdf
    • https://cdn.shopify.com/s/files/1/0431/4857/4884/files/zolavida.pdf
    • https://cdn.shopify.com/s/files/1/0431/2521/1298/files/kiwojidovovufazu.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_off00006733.bin
1d03a68520f3723345e9c74f8fad52cf15e58d92d442b2d1250fa9305459ea24
pdf-font-stream PDF embedded font (sfnt) at offset 0x6733 5412 bytes
font_01_sfnt_off00007970.bin
8dd1e19f3d6cf5402b15a4440d785cc773b9321474d47cc81702d12e55008aa6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7970 10060 bytes