Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e072a4d095217b…

MALICIOUS

PDF

43.8 KB Created: 2020-08-07 10:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c53cb8f22d89430a6686f6b2c1afadd2 SHA-1: 6ab85c3c3379934b28679513a3b62c7a5c1659bc SHA-256: c3e072a4d095217bf49d4b49040a987e7b9f768927bba2711d7f261d93762483
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lure users to malicious content. The document body, though heavily obfuscated, contains the text 'Spinal arachnoiditis pdf' and the URL, suggesting a lure for users searching for medical information. The PDF also hosts a large number of external links, many pointing to Shopify, likely as part of a link farm to improve SEO for malicious content.

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.cc/pify?keyword=spinal+arachnoiditis+pdf
    • http://files.naacpaustin.com/uploads/1/3/2/6/132681969/9eee5a3551736.pdf
    • http://files.leeshearman.com/uploads/1/3/2/6/132682124/vururo_rokanoverida_suladaru.pdf
    • http://files.brownwoodlyrictheatre.com/uploads/1/3/2/6/132695438/3901383.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5274/files/62380510016.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0106/files/woxisimakuzitid.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/leliwezanagulagif.pdf
    • https://cdn.shopify.com/s/files/1/0429/0448/6055/files/best_reader_software_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lomapatigusobotatijizu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4705/0661/files/70502286003.pdf
    • https://cdn.shopify.com/s/files/1/0432/5595/5619/files/fojuforegolijebabixim.pdf
    • https://cdn.shopify.com/s/files/1/0431/8773/2644/files/87728942465.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/pdf_text_editing_software_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/6761/2063/files/zozodexus.pdf
    • https://cdn.shopify.com/s/files/1/0434/0485/3402/files/11928494699.pdf
    • https://cdn.shopify.com/s/files/1/0437/6710/3645/files/muzazekugivasudij.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_off00006da0.bin
c93defdc6e6bf22008d8f6256e422c3909e1b3a41a633714f21c404772b7ba9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA0 5344 bytes
font_01_sfnt_off00007fc5.bin
c7bbb61e52ed8f0a540b1ee8c4931b88f21a6441f29c17714c4821e444629f5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC5 10044 bytes