Malicious PDF — malware analysis report

Static analysis result for SHA-256 b599d02dab5d4990…

MALICIOUS

PDF

46.9 KB Created: 2020-08-21 15:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc5b1a2f2d54a1e5f139ed900c7c9bfd SHA-1: c743bf084d21f7cf3626329c832d27d0a0b42dc5 SHA-256: b599d02dab5d4990208ed33b4585048f686991ab567e0c3e33d0e51cce1d528f
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a custody agreement template. This indicates a phishing or social engineering attempt to redirect the user to malicious content. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm used for SEO poisoning or to obscure the final malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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=custody+agreement+template+virginia
    • http://files.prestonphotographicsociety.org/uploads/1/3/1/4/131437319/somifobe-kijulosirut-rukademaz-dajubedasigan.pdf
    • https://cdn.shopify.com/s/files/1/0434/3499/9975/files/18405077474.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/kuwedowamusop.pdf
    • https://cdn.shopify.com/s/files/1/0447/3936/2970/files/antibioticos_macrolidos.pdf
    • https://cdn.shopify.com/s/files/1/0432/9956/9829/files/51461797955.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9625/files/patidiwaxirafa.pdf
    • https://cdn.shopify.com/s/files/1/0430/0383/8615/files/synonym_worksheet_2nd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5575/files/capitalismo_socialismo_y_democracia.pdf
    • https://cdn.shopify.com/s/files/1/0440/5549/4806/files/prentice_hall_chemistry_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/4085/8527/files/zogelarojudisuruvaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1733/files/fupeviwarobutigarasaxek.pdf
    • https://cdn.shopify.com/s/files/1/0435/8635/5357/files/index_of_canais.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/sawagamotunabuzagisexi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2371/1903/files/smackdown_here_comes_the_pain_caws.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_off00007917.bin
05752833628fce060b1b5e9febefe84a370cfab7117355944b4279d0c0a44011		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7917 5344 bytes
font_01_sfnt_off00008b37.bin
1497e2bd98d465816e60fd7426eb2388c515610da088d0f9be8a87bcf3f73dc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B37 10464 bytes

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