Malicious PDF — malware analysis report

Static analysis result for SHA-256 711b9157913c7c94…

MALICIOUS

PDF

43.9 KB Created: 2020-08-01 19:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65d18375c583bc40d8fbd95d7aa0cdf7 SHA-1: eb5f23f50296860d9c154203166efc4f0d7d35c1 SHA-256: 711b9157913c7c94c1a3eea0f2f5c01b89307fd3cfc3cb133321d7038de4e882
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'bootable usb windows 7 mac'. The presence of numerous external PDF links suggests a link farm or redirection strategy. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure.

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.cc/pify?keyword=bootable+usb+windows+7+mac
    • http://files.waystothinkandlearn.com/uploads/1/3/1/6/131636903/9113826bff6.pdf
    • http://files.saverenodumpsterdiving.com/uploads/1/3/0/7/130738622/a04b40642d.pdf
    • http://files.createdbychrista.com/uploads/1/3/0/7/130739621/782151.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2296/7207/files/buxemokejiwa.pdf
    • https://cdn.shopify.com/s/files/1/0440/3236/0613/files/78572262856.pdf
    • https://cdn.shopify.com/s/files/1/0431/6204/2532/files/40366413490.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4248/files/99158499217.pdf
    • https://cdn.shopify.com/s/files/1/0435/7442/7806/files/24399771964.pdf
    • https://cdn.shopify.com/s/files/1/0433/4452/7511/files/86995523145.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19463184481.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7663/files/46089533439.pdf
    • https://cdn.shopify.com/s/files/1/0433/8761/7447/files/mogumudiketimabilonuda.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/puparofurevugumedakavupu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cf6.bin
51e1847b45ddddc6106291dd18c239b81a7757d831341aa9ca321a4957be9d5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF6 5348 bytes
font_01_sfnt_off00007f2d.bin
2d454f5cea0c77107dac2d1741136372500a9accb9cb994de6cd9d8a24a8551e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2D 10504 bytes