Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6151a3894eac52…

MALICIOUS

PDF

41.7 KB Created: 2020-08-18 23:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5af75ba1fdd4a0838f06473bb346a28 SHA-1: 8fe2fe58adc697ee086700d79f8e24568afea8e4 SHA-256: eb6151a3894eac527507cafbb7550e150e51f2a4604cf49cbde3d385bc7d8a9b
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector at ttraff.ru. The document body, though partially corrupted, contains text related to a 'request letter for approval of proposal', suggesting a social engineering lure. The primary attack pattern involves redirecting the user through the malicious URL to a secondary malicious resource.

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=request+letter+for+approval+of+proposal+pdf
    • http://files.mainstreetenid.org/uploads/1/3/1/3/131380915/4815782.pdf
    • http://files.yeahviva.net/uploads/1/3/0/8/130813906/3337478.pdf
    • http://pituwuz.school.stmaryspontiac.org/uploads/1/3/0/8/130873952/nupokexu.pdf
    • http://dujite.gammazeta-pistate-dkg.org/uploads/1/3/0/8/130814328/7947064.pdf
    • http://files.parishofhoylandsaintandrew.com/uploads/1/3/1/4/131438741/xivajesenam_kizagowo_poniwonaluwiw.pdf
    • https://cdn.shopify.com/s/files/1/0437/6231/9518/files/kirodeposixeresimavove.pdf
    • https://cdn.shopify.com/s/files/1/0434/2333/4567/files/gukawodomo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9515/4070/files/pevaxepiturikobawev.pdf
    • https://cdn.shopify.com/s/files/1/0437/8381/5325/files/66234761827.pdf
    • https://cdn.shopify.com/s/files/1/0428/6034/7551/files/4804932860.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/az_diamondbacks_road_uniforms.pdf
    • https://cdn.shopify.com/s/files/1/0437/3122/2682/files/pegedipadedopavalaxita.pdf
    • https://cdn.shopify.com/s/files/1/0435/3189/4944/files/lijedot.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/tujovasuxemogipujaneze.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_off000066d0.bin
9ccc89524c5376fefc724e428f0efdf6e755439eb340efb8d8d3820945eec973		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D0 5228 bytes
font_01_sfnt_off000078af.bin
09332a5dac3a4825a82ce655c2b7538a3d89815564891c1f504ab17263b2f736		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78AF 9692 bytes

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