Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f135806056b55eb…

MALICIOUS

PDF

41.8 KB Created: 2020-08-30 11:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06dc0cb510dda897d56d96974121b506 SHA-1: 840cd41823f140f3ee7587ba8070fa694b9a1c4d SHA-256: 4f135806056b55eb231d8ee49e04aef4375212d8552f71a51be786f79a35744d
150 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.com, which is disguised as a search result for 'intermediate accounting for dummies'. The document also contains a large number of links to Shopify-hosted PDFs, likely an attempt to appear legitimate or to obscure the malicious redirector. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=intermediate+accounting+for+dummies
    • https://cdn.shopify.com/s/files/1/0432/9242/6405/files/23316451692.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/4996/files/32066616196.pdf
    • https://cdn.shopify.com/s/files/1/0432/1257/0783/files/82268857710.pdf
    • https://cdn.shopify.com/s/files/1/0433/9371/2286/files/11957211603.pdf
    • https://cdn.shopify.com/s/files/1/0435/2724/1879/files/46909362075.pdf
    • https://cdn.shopify.com/s/files/1/0430/6518/0321/files/58646406478.pdf
    • https://cdn.shopify.com/s/files/1/0429/1090/8572/files/21071384073.pdf
    • https://cdn.shopify.com/s/files/1/0436/5703/5929/files/6261874323.pdf
    • https://cdn.shopify.com/s/files/1/0439/1505/1163/files/kenya_budget_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/71432318500.pdf
    • https://cdn.shopify.com/s/files/1/0432/1532/3291/files/63874246330.pdf
    • https://cdn.shopify.com/s/files/1/0438/4312/5405/files/79059007328.pdf
    • https://cdn.shopify.com/s/files/1/0435/1796/8543/files/telugobedesuwu.pdf
    • https://cdn.shopify.com/s/files/1/0461/7558/4419/files/36217805252.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/allstate_cancer_insurance_claim_forms.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_off0000659b.bin
8f0d6e652dbec28d868202594505b000ffea18f981f6eb696954fefdcbc3bb88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x659B 5248 bytes
font_01_sfnt_off00007753.bin
d7e8a68292e06de87b311004763ad626f9256b511a0105d62ace22bf9a48d1f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7753 10112 bytes

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