Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd9a0c2cdbb710c…

MALICIOUS

PDF

38.9 KB Created: 2020-08-30 12:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11f688a30a865f06de777f7071cd6313 SHA-1: 398d818cb116b4a76fbb9484ce05bd835c49d1aa SHA-256: 5dd9a0c2cdbb710c0de812cb53cb4e9e0ac7fe9f44886d58b058a349a435f192
154 Risk Score

Malware Insights

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

This PDF document contains a link farm, with one critical link pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that is also present in the PDF's embedded link farm, suggesting a lure to download potentially malicious content. No scripts were extracted from this sample.

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.com/wix?keyword=let+us+c+by+yashwant+kanetkar+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/33162056307.pdf
    • https://cdn.shopify.com/s/files/1/0437/6992/1690/files/matepirolojikam.pdf
    • https://cdn.shopify.com/s/files/1/0439/4716/3806/files/best_in_slot.pdf
    • https://cdn.shopify.com/s/files/1/0434/0980/1365/files/science_literacy_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/23299589317.pdf
    • https://cdn.shopify.com/s/files/1/0431/6862/8892/files/zujigasepigufab.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/62617639721.pdf
    • https://cdn.shopify.com/s/files/1/0432/8544/6824/files/sewagezinakipomipidixida.pdf
    • https://cdn.shopify.com/s/files/1/0435/4582/1333/files/bed_wars_pc_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0435/9893/8274/files/jemuzova.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6614/files/kitajulexuwanejuwaxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1041/files/baixar_para_celular_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/3355/8182/files/dutajejijerasojuketaz.pdf
    • https://cdn.shopify.com/s/files/1/0440/8557/5845/files/25262501747.pdf
    • https://cdn.shopify.com/s/files/1/0434/1471/6572/files/6009552214.pdf
    • https://cdn.shopify.com/s/files/1/0437/1401/9496/files/counting_numbers_worksheet_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1588/files/analytics_maturity_model_informs.pdf
    • https://cdn.shopify.com/s/files/1/0431/3507/4465/files/94825108196.pdf
    • https://cdn.shopify.com/s/files/1/0432/9639/1323/files/97436776678.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_off000057b8.bin
9c82bf0f0f0beb136cddeeb5026e02c902ff7931f84c83fe3192c088382a2744		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57B8 5552 bytes
font_01_sfnt_off00006aa1.bin
e74d347788d0d31f0ec0b428f20f916f3e5b399052b47d438198d5718ca76c3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA1 10796 bytes

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