Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdc96c4b2d0cc3b…

MALICIOUS

PDF

65.8 KB Created: 2020-08-14 00:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9a95894b6d63dada297dca5b1b4100f SHA-1: 71a4997f172b486d5a1d03e62ee87c110d222650 SHA-256: cfdc96c4b2d0cc3b4c7f5f7f8473789bd0eba37ca85aa087871838e337ce26be
150 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL that triggers the redirection. The PDF_SEO_LINK_FARM heuristic further suggests a pattern of generating numerous links, likely for SEO poisoning or to distribute malicious content. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=qualitative%20research%20define%20pdf
    • http://files.teadrunktailor.com/uploads/1/3/1/4/131453206/sakolerojoxuj.pdf
    • http://files.designsbykneeknee.com/uploads/1/3/2/6/132682076/619012.pdf
    • http://files.theputneypolestudio.com/uploads/1/3/1/6/131636719/9240263.pdf
    • http://files.peacememorialauditorium.org/uploads/1/3/1/4/131483148/nigazuzetiruvabu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8448/9631/files/99106783933.pdf
    • https://cdn.shopify.com/s/files/1/0434/3876/8284/files/avon_catalogue_septembre_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/2200/7969/files/82291872545.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75609531209.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/juxumadebamapetutorobegew.pdf
    • https://cdn.shopify.com/s/files/1/0434/0039/6956/files/biosensors_in_agriculture.pdf
    • https://cdn.shopify.com/s/files/1/0428/1873/2191/files/adaptis_gel.pdf
    • https://cdn.shopify.com/s/files/1/0429/2309/8279/files/kijusuzazudugozufezexu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3483/7149/files/madugususifowamajununuga.pdf
    • https://cdn.shopify.com/s/files/1/0444/3347/3702/files/dell_optiplex_gx620_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/3220/7782/files/network_marketing_training.pdf
    • https://cdn.shopify.com/s/files/1/0438/7271/4920/files/history_of_islam_in_urdu_books_download.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_off0000c4aa.bin
4e1246d8d1bc9a1aec41c9fbf4c50384358a14e320ab3e88f63cbf4c9a502537
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AA 5364 bytes
font_01_sfnt_off0000d6e5.bin
22df6cf3ae320ff008e5842bca93374c9e9203800c1125665919a191f2aad11a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E5 10460 bytes