Malicious PDF — malware analysis report

Static analysis result for SHA-256 70429cba41f6ba43…

MALICIOUS

PDF

40.5 KB Created: 2020-08-19 02:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84ec3ee6915bf025905e516556b7e7b3 SHA-1: 77c81770c28f475e2a97b88409ee6ba55d33ad3f SHA-256: 70429cba41f6ba436810b091c6199e8b9f1e1195e3f638d00de776439fa64367
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain text related to a 'residential tenancy branch bc condition inspection report', suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO for malicious content. The ML classifier strongly flagged this PDF as malicious.

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=residential+tenancy+branch+bc+condition+inspection+report
    • http://files.savanfinancial.com/uploads/1/3/2/8/132815767/ad5bde.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8095/8617/files/mexabenamexid.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/69961391565.pdf
    • https://cdn.shopify.com/s/files/1/0435/6086/1845/files/43691604849.pdf
    • https://cdn.shopify.com/s/files/1/0431/7220/0608/files/xodofatisowuxiju.pdf
    • https://cdn.shopify.com/s/files/1/0443/6020/4444/files/46317277383.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/biblical_eldership_strauch.pdf
    • https://cdn.shopify.com/s/files/1/0431/3353/4357/files/jolly_phonics_activity_book_6.pdf
    • https://cdn.shopify.com/s/files/1/0453/9233/0920/files/capacitacion_riesgo_electrico.pdf
    • https://cdn.shopify.com/s/files/1/0432/7286/3904/files/worship_music_chords.pdf
    • https://cdn.shopify.com/s/files/1/0430/9988/1639/files/gawogixodimimetajixowug.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4823/files/tasarufurudaxike.pdf
    • https://cdn.shopify.com/s/files/1/0438/6842/2309/files/vias_de_absorcion_de_los_farmacos.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_off00006084.bin
6cad9efb1ccbd3c72ee4b6eb88327d3b7fdb361c019898c4d2c41ec0dfab7eb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6084 5412 bytes
font_01_sfnt_off000072da.bin
ee02a99c140fb87c1933874516be5f9a1a4e826f34546f82e8a470a7978d7993
pdf-font-stream PDF embedded font (sfnt) at offset 0x72DA 9880 bytes