Malicious PDF — malware analysis report

Static analysis result for SHA-256 f170bc428e4e53c0…

MALICIOUS

PDF

39.8 KB Created: 2020-08-17 07:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac570a3e89b9b13703f3738de038c6bf SHA-1: 88fe7a78871c39f93586ea0ca6f9215947032481 SHA-256: f170bc428e4e53c0d62e171972d3c392786d92c4b45acd1d3bdfb764de3f66da
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains this URL and a large number of other URLs hosted on 'cdn.shopify.com', suggesting a link farm or content stuffing technique. The ML classifier also flagged this PDF with high confidence. The primary attack pattern involves luring the user to the malicious redirector.

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=mobile+phone+number+format+italy
    • http://ketajewe.willynillyphotography.com/uploads/1/3/1/0/131070711/ximudibasilos.pdf
    • https://cdn.shopify.com/s/files/1/0430/1098/2041/files/binowerori.pdf
    • https://cdn.shopify.com/s/files/1/0446/2054/6211/files/cambium_ptp_550.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/jozasisokelule.pdf
    • https://cdn.shopify.com/s/files/1/0453/5566/3515/files/variedades_de_milho_em_mocambique.pdf
    • https://cdn.shopify.com/s/files/1/0428/3170/8316/files/talikopigi.pdf
    • https://cdn.shopify.com/s/files/1/0438/7920/2984/files/86515153129.pdf
    • https://cdn.shopify.com/s/files/1/0432/2384/2978/files/mexofuwoxigesigobi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5815/7982/files/luxanoxobituk.pdf
    • https://cdn.shopify.com/s/files/1/0431/8694/6206/files/robutotesomo.pdf
    • https://cdn.shopify.com/s/files/1/0454/2342/7752/files/varicela_en_pediatria_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/0691/0887/files/96523843013.pdf
    • https://cdn.shopify.com/s/files/1/0433/7221/6483/files/estrous_cycle_in_pigs.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_off00005b82.bin
c3b18ed1c200a81077075345f9ae75bd9402383d9c9948916bc1b1a4fab488b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B82 5208 bytes
font_01_sfnt_off00006d13.bin
8626a291d65d03d920d3216f2046e84923e00639f9b2945aecdb84fb2de0bdfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D13 10468 bytes

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