Malicious PDF — malware analysis report

Static analysis result for SHA-256 212bb93a95471f4e…

MALICIOUS

PDF

46.9 KB Created: 2020-08-04 06:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9c81fd54939d1da76eeb47debdc3500 SHA-1: 38e087485ce8a353ed5cebec2cde111d4771374b SHA-256: 212bb93a95471f4ef1fda16b16e3a161b4c0848f9953f5a46bda11e08cd65063
150 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, ttraff.com. The document body, though heavily obfuscated, contains text related to 'informal letter writing topics for class 7 pdf' and the malicious URL itself, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy to potentially improve SEO and distribute the malicious content.

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/pify?keyword=informal+letter+writing+topics+for+class+7+pdf
    • http://files.cakemediahq.com.au/uploads/1/3/1/0/131070112/xowotadatixupawam.pdf
    • http://files.impact-outfitters.com/uploads/1/3/2/6/132681951/dudixebes.pdf
    • http://files.laurenandersonrealty.com/uploads/1/3/2/7/132710676/fb2e28b83cf29d3.pdf
    • http://files.impact-outfitters.com/uploads/1/3/2/6/
    • https://cdn.shopify.com/s/files/1/0427/5086/9671/files/pebisafosazekapalim.pdf
    • https://cdn.shopify.com/s/files/1/0436/1856/6306/files/38331032247.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/zepodesekul.pdf
    • https://cdn.shopify.com/s/files/1/0432/0962/1665/files/70143102615.pdf
    • https://cdn.shopify.com/s/files/1/0429/5966/7363/files/old_forge_web_cam.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32505595602.pdf
    • https://cdn.shopify.com/s/files/1/0439/1341/2760/files/abecedario_para_imprimir_y_recortar.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8395/files/54020749624.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/95826039164.pdf
    • https://cdn.shopify.com/s/files/1/0445/3338/3332/files/kaprekar_s_constant.pdf
    • https://cdn.shopify.com/s/files/1/0432/6083/8050/files/pogipekel.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_off00007795.bin
a1d3812d09e9b6fe7a0705c8bbe3f8a57c840d37a0505c37fac1d814ea493362		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7795 5584 bytes
font_01_sfnt_off00008a98.bin
835cf5ba41178b49a11609735f47e4120a938ef3861dd42ee570fd17eb377633		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A98 10440 bytes

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