Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5594c70f9ca08e8…

MALICIOUS

PDF

41.0 KB Created: 2020-08-14 14:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f990435da5940c8341b36a4999a9d105 SHA-1: 645c5268b67e59747790be7d9fa31780eff08930 SHA-256: b5594c70f9ca08e8ea4b6190b75698e80650ab6b9d1c4b7f3fe8c60a77c76b85
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that the document is designed to redirect users to harmful sites.

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=animal+crossing+new+leaf+shampoodle+hairstyle+guide
    • http://burobo.saramelodyart.com/uploads/1/3/2/3/132302815/penaridok.pdf
    • http://files.litatrimmingsphotography.com/uploads/1/3/1/8/131856146/jusodun.pdf
    • http://files.regionfiveadulted.com/uploads/1/3/2/6/132681670/mawuxe.pdf
    • http://files.anahidskitchen.com/uploads/1/3/0/9/130969923/kekukokexade-zusoranerawavok-davokun.pdf
    • https://cdn.shopify.com/s/files/1/0448/0276/9053/files/ariana_grande_broadway.pdf
    • https://cdn.shopify.com/s/files/1/0435/1184/0927/files/70085162937.pdf
    • https://cdn.shopify.com/s/files/1/0429/7313/5011/files/zogupeninugulegak.pdf
    • https://cdn.shopify.com/s/files/1/0432/7414/1864/files/vizedopininexanox.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/17505329793.pdf
    • https://cdn.shopify.com/s/files/1/0431/1895/2612/files/wemojeruvigo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4070/9527/files/52988023688.pdf
    • https://cdn.shopify.com/s/files/1/0431/6915/3181/files/66451261928.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6657/files/memuwazewuremevo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6460/7398/files/42624175372.pdf
    • https://cdn.shopify.com/s/files/1/0432/6873/5140/files/42639803435.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_off00006068.bin
7b6f828029a655ff1c39c578f328fc08827b5c1833496a39afdb70c74aab346a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6068 5752 bytes
font_01_sfnt_off000073d8.bin
625d81df7eea55ab1f683035830c6407d06220308013dada858491ea0b9272d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x73D8 10292 bytes