Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ef8c8eb8d9c625…

MALICIOUS

PDF

33.9 KB Created: 2020-08-13 22:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00583c1d4a5c10fb255368e64016de62 SHA-1: 619c330bac6b1a2ff61a9da8f92848d2d442b628 SHA-256: a0ef8c8eb8d9c625e4f9b4d1bac08163d352292c735b428d8a4bcb784136bc10
150 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, but one critical link redirects to a known malicious domain (ttraff.ru). This indicates a link farm or redirection tactic to lure users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=mathematical+models+of+communication+channel+pdf
    • http://files.agingresourcesdougco.org/uploads/1/3/0/9/130969489/5561474.pdf
    • http://files.concepcionslashes.com/uploads/1/3/1/1/131164568/2d18da.pdf
    • http://kasigutuj.matthewpeckhamtenor.com/uploads/1/3/2/7/132740435/91070550f555e.pdf
    • http://files.mysteryofmagic.com/uploads/1/3/0/7/130776058/tidatumemupo.pdf
    • http://files.orkm.org/uploads/1/3/0/7/130739614/9213159.pdf
    • https://cdn.shopify.com/s/files/1/0431/7904/9121/files/18377175407.pdf
    • https://cdn.shopify.com/s/files/1/0437/9898/6909/files/molirokelamadiwaralos.pdf
    • https://cdn.shopify.com/s/files/1/0431/8402/9854/files/dixopiwutarotesumikipaxod.pdf
    • https://cdn.shopify.com/s/files/1/0429/7195/5351/files/95326263440.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/669297692.pdf
    • https://cdn.shopify.com/s/files/1/0432/4553/5400/files/heavy_vehicle_technology_books.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/74003217650.pdf
    • https://cdn.shopify.com/s/files/1/0432/4396/2532/files/25210346862.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/32225400221.pdf
    • https://cdn.shopify.com/s/files/1/0431/6463/1195/files/nokineresarawezozegeku.pdf
    • https://cdn.shopify.com/s/files/1/0432/3157/6231/files/belarus_visa_application.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7448/files/negogus.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_off000049fc.bin
4604a27343251f91f72fdc76e45d9521d5e1d6b469fa58172d054737f9435490		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49FC 5304 bytes
font_01_sfnt_off00005bed.bin
b5883ed3f4e7a4397195180251c5cd8f10d5e00c817c9dd223750278ea50b49d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BED 8900 bytes

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