Malicious PDF — malware analysis report

Static analysis result for SHA-256 046c38c8df9ff4df…

MALICIOUS

PDF

59.4 KB Created: 2020-08-18 15:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bddd58531cfa8f34971002132f56b28a SHA-1: c518bc453d6763cacac8222014959ff0197cdb54 SHA-256: 046c38c8df9ff4df5469f242515e8b4ad9c36cbe57b009ef49058a56fd12662a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, many of which point to a link farm hosted on Shopify, and one critical link redirects to known malicious infrastructure. The document body itself contains text that appears to be search result snippets, further supporting the lure of directing users to external sites. The ML classifier also strongly indicated maliciousness.

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=chisel+honing+guide+bunnings
    • http://dusifun.q3tennis.net/uploads/1/3/0/7/130776031/tawofitir.pdf
    • http://files.paulinepeelconsulting.com/uploads/1/3/0/7/130775784/zemebizijixar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2585/6672/files/large_intestine_anatomy_and_physiology.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vitalifurefafimeribedewo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5609/4614/files/votepul.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dogazuzotefoninu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9554/7303/files/morijerume.pdf
    • https://cdn.shopify.com/s/files/1/0435/5427/5479/files/nepimovinofituwezedukuve.pdf
    • https://cdn.shopify.com/s/files/1/0431/0066/8065/files/davijazituteluwanabogiji.pdf
    • https://cdn.shopify.com/s/files/1/0449/8400/8862/files/45604841478.pdf
    • https://cdn.shopify.com/s/files/1/0433/7483/7925/files/el_sistema_nervioso_central.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_off0000ac77.bin
fb9d08aba7f9dbb11b2db813a36ffc05796826385fbc761af85b02358e5841cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC77 4824 bytes
font_01_sfnt_off0000bcd7.bin
230b509579bc9ea15d15a2685b2a24a49528abd8542da28d459642af8d02a54e
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD7 10724 bytes