Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca596ea8ceecbed5…

MALICIOUS

PDF

51.3 KB Created: 2020-08-09 17:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd23988dc90e51171b04ae3b58b002dd SHA-1: ef9ee20f7fc54327878b094c7887b3be049af966 SHA-256: ca596ea8ceecbed5a8c4dc7d5ec22103a1bd1e82bfe0f8757250f68d7524f59c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. This indicates a link farm or SEO poisoning attack designed to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=evangelios+apocrifos+de+la+biblia+pdf
    • http://files.windwardtoeden.com/uploads/1/3/0/7/130740252/xotonozovagoxi_wewenitetesez_rawerifumibolu_zibowujebazerof.pdf
    • http://tivoz.riggsaroo.com/uploads/1/3/1/0/131070450/4178522.pdf
    • http://files.khrystaljcounseling.com/uploads/1/3/1/4/131406535/3894a5d101.pdf
    • http://tamakupef.thewhitefamilyreunionisaiahcarrie.com/uploads/1/3/0/7/130775432/jirogak.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/36482847380.pdf
    • https://cdn.shopify.com/s/files/1/0431/0797/5335/files/xaromosunifegaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fakuwonilojovaxibudebu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/belojagar.pdf
    • https://cdn.shopify.com/s/files/1/0432/0608/2717/files/duguwejuf.pdf
    • https://cdn.shopify.com/s/files/1/0439/7232/9630/files/sesame_street_sesame_sings_karaoke.pdf
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/24478710771.pdf
    • https://cdn.shopify.com/s/files/1/0432/2017/2957/files/shapeshift_time_remaining_expired.pdf
    • https://cdn.shopify.com/s/files/1/0432/3105/1931/files/80695595771.pdf
    • https://cdn.shopify.com/s/files/1/0432/6978/3720/files/kodixotosinabox.pdf
    • https://cdn.shopify.com/s/files/1/0441/1247/8360/files/segomi.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_off0000876d.bin
d6f9862272d403ad3efc27642ce1c6e92ebf29acbac9a37c41a829dd6308f506
pdf-font-stream PDF embedded font (sfnt) at offset 0x876D 5480 bytes
font_01_sfnt_off00009a25.bin
ee48d78bac8c9db53aee07d9ead0b04645f09a0fa4776a3d1be5c6623c1a7c45
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A25 11184 bytes