Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a37403cd2589db…

MALICIOUS

PDF

36.8 KB Created: 2020-08-16 01:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a053b136cae5640b6525155fa21f46df SHA-1: 22d53833ad049ecdb7fbdf7ed06859d28c548280 SHA-256: 57a37403cd2589dbfc04f1b6576cc84399b64696524eacde8bb16ba9b3684f30
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 of which point to potentially malicious redirectors or link farms. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate that the document is designed to redirect users to harmful sites. The ML classifier also strongly suggests maliciousness. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous external links is the primary indicator of 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.cc/wb?keyword=sociolinguistics%20spolsky%201998%20pdf
    • http://muboxewab.fullcircleperformingarts.com/uploads/1/3/2/7/132741066/9801835.pdf
    • http://tevagif.aaronjgodwin.com/uploads/1/3/1/6/131607062/4366004.pdf
    • http://files.chesterfootclinic.co.uk/uploads/1/3/0/7/130739315/1e8f04c22b31b4b.pdf
    • http://matubu.rentalcottageontario.com/uploads/1/3/2/3/132303382/6780528.pdf
    • http://silajitiz.theallergicchef.ca/uploads/1/3/1/6/131606289/fb584.pdf
    • https://cdn.shopify.com/s/files/1/0433/7175/7718/files/wijurow.pdf
    • https://cdn.shopify.com/s/files/1/0428/2518/7491/files/32638124.pdf
    • https://cdn.shopify.com/s/files/1/0433/5285/0586/files/99666592961.pdf
    • https://cdn.shopify.com/s/files/1/0430/0305/2191/files/68296788789.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pewugokujugiwiburonanas.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/davesabudovititan.pdf
    • https://cdn.shopify.com/s/files/1/0435/5253/8787/files/90973245729.pdf
    • https://cdn.shopify.com/s/files/1/0431/7793/5004/files/36469888771.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/16148428719.pdf
    • https://cdn.shopify.com/s/files/1/0431/2688/2471/files/andromonoecious_definition.pdf
    • https://cdn.shopify.com/s/files/1/0431/3628/6877/files/lurajunojulaxabuwusu.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_off000050e6.bin
4d05ae58965aee2f4301abca4077b5fa41464fce141a98f2261979d82472b0cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50E6 5688 bytes
font_01_sfnt_off00006462.bin
bcf84bb763459ab8d56bbf2b4664e8f63c84d3bf67e61514d1aea5f82b381c48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6462 9976 bytes

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