Malicious PDF — malware analysis report

Static analysis result for SHA-256 393f2ab5249b789d…

MALICIOUS

PDF

45.2 KB Created: 2020-08-10 21:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0427f3d9ec9d60074d938766ae42b613 SHA-1: 3c2d2e22299db96d4d0a9a556d05591c5360860e SHA-256: 393f2ab5249b789d157c74296e7e359f2795f84dcccf0d0c74578b1d3d408680
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=list+of+general+abbreviations+pdf', suggesting a lure to trick users into clicking the link. The ML classifier strongly indicated maliciousness, and the presence of numerous links to PDF files hosted on various domains points to a link-farming or redirection scheme.

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=list+of+general+abbreviations+pdf
    • http://files.languagesnsw-greek.com/uploads/1/3/2/3/132303226/849e5e.pdf
    • http://files.petershenkinlaw.com/uploads/1/3/1/8/131860938/sosuzunavevudi.pdf
    • http://sinon.lvpoutlet.com/uploads/1/3/1/6/131606552/8671634.pdf
    • http://files.saintpaulstrong.org/uploads/1/3/1/4/131454373/7819212.pdf
    • http://files.lepeuplevs.com/uploads/1/3/2/8/132814930/gabetibiwa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8163/7794/files/174587755.pdf
    • https://cdn.shopify.com/s/files/1/0434/7265/0397/files/91807689863.pdf
    • https://cdn.shopify.com/s/files/1/0428/5743/1196/files/xukolikakevutapulalejodoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/rilatilijutimagewivo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/peboginesewuxexadamo.pdf
    • https://cdn.shopify.com/s/files/1/0440/8626/3960/files/complete_guide_to_drawing_from_life.pdf
    • https://cdn.shopify.com/s/files/1/0433/2594/8072/files/kivogisulobelezu.pdf
    • https://cdn.shopify.com/s/files/1/0447/5496/0535/files/plano_turistico_almeria.pdf
    • https://cdn.shopify.com/s/files/1/0435/4742/6965/files/class_12_cbse_chemistry_ncert_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/5956/0086/files/kojufajekafiwekaduzaxu.pdf
    • https://cdn.shopify.com/s/files/1/0440/2439/7989/files/27034426929.pdf
    • https://cdn.shopify.com/s/files/1/0432/2813/5592/files/dudimotukalitakixex.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_off00007319.bin
00a96b2bb52a73111929381557148025ecb96e44f5dc19485bc9fef4db046c03
pdf-font-stream PDF embedded font (sfnt) at offset 0x7319 5352 bytes
font_01_sfnt_off0000855d.bin
1738e34c4d92722819ae24ca21c1536250e61cf75e7a214dc4962abb1c059b0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x855D 10108 bytes