Malicious PDF — malware analysis report

Static analysis result for SHA-256 59943c7f830de6c4…

MALICIOUS

PDF

61.4 KB Created: 2020-09-18 23:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 028147153b09df89ad1e7a3cc20b426a SHA-1: d60a64a85615afec992046b104f3fe287e08ccc0 SHA-256: 59943c7f830de6c422bcd3aed30ffccf47a96b923a91e2d43c9ea8c321b6dbc3
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which are structured to appear as SEO-optimized links to other PDF documents. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/wix?keyword=birds+of+colorado+images'. The ML classifier also strongly indicated maliciousness. The document body itself is largely unreadable binary data, but the presence of the malicious redirector URL and the link farm structure strongly suggest a malicious intent, likely to drive traffic to malicious sites or to manipulate search engine results.

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/wix?keyword=birds+of+colorado+images
    • http://files.bluetrilliumdesigns.com/uploads/1/3/1/3/131383982/zuzekaxofijijusebe.pdf
    • http://mebasi.mrsbrigham.org/uploads/1/3/1/4/131483067/5917454.pdf
    • http://pafunot.hocobicyclerentals.com/uploads/1/3/2/3/132303219/rikede.pdf
    • http://vogewako.adventuresinfullness.com/uploads/1/3/1/4/131454526/62ecd4375f9ed.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/xovunugesamarese.pdf
    • https://cdn.shopify.com/s/files/1/0439/0780/9448/files/52452881294.pdf
    • https://aea3ba74-a818-4c55-b8cf-8bd8b5872db3.filesusr.com/ugd/daca0d_6b0ff9fbd99444e9ba7d504b3f2ed753.pdf?index=true
    • https://5b6e2ede-b22d-49ad-b0f0-d8b2ebfee56a.filesusr.com/ugd/b58d21_68798edee00549048048535565de9033.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0429/2132/8807/files/fevinamirorexemitakufe.pdf
    • https://cdn.shopify.com/s/files/1/0433/5019/6392/files/varicela_en_los_nios.pdf
    • https://cdn.shopify.com/s/files/1/0431/4244/7261/files/dowokoposuwuwomiwoki.pdf
    • https://cdn.shopify.com/s/files/1/0481/3157/1879/files/zebabexexakabi.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_off0000b4fe.bin
6652ec4a52ccd71166418c9850470f25c08e752e6080de76cba047e6f7e5efc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FE 5388 bytes
font_01_sfnt_off0000c73d.bin
732ee4f7699fc13c003586dcb60fb97878640db7c86c71b1d6b214d55f542003		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC73D 9744 bytes

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