Malicious PDF — malware analysis report

Static analysis result for SHA-256 500c8975f3a44383…

MALICIOUS

PDF

54.7 KB Created: 2020-08-17 17:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b85cf9bd6ec080a70be0f741a2ffcea4 SHA-1: 7db08fb9f9e7394f9652101ae9ceed698acde342 SHA-256: 500c8975f3a44383abd4964d945cc4cd1e43d98845ad401a0be9ffa40bbe1f5a
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=top+movie++sites+malayalam'. The document body, though heavily obfuscated, contains this URL and other Shopify URLs, reinforcing the lure. The ML classifier also flagged this PDF with high confidence.

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.ru/pify?keyword=top+movie++sites+malayalam
    • http://files.thelostblonde.com/uploads/1/3/1/6/131606393/wodalak.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3351/files/8205589498.pdf
    • https://cdn.shopify.com/s/files/1/0436/6050/9337/files/call_of_cthulhu_character_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/5497/3606/files/lopukiga.pdf
    • https://cdn.shopify.com/s/files/1/0437/6032/0663/files/xudunojasapowo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/89584828391.pdf
    • https://cdn.shopify.com/s/files/1/0430/8746/2551/files/mudojenekelajuvobefun.pdf
    • https://cdn.shopify.com/s/files/1/0433/8427/5109/files/raspbian_commands.pdf
    • https://cdn.shopify.com/s/files/1/0431/7881/9735/files/94663879040.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5127/files/69307508817.pdf
    • https://cdn.shopify.com/s/files/1/0440/0952/1317/files/30119022646.pdf
    • https://cdn.shopify.com/s/files/1/0445/6369/3732/files/nested_if_statements_python.pdf
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/43853809215.pdf
    • https://cdn.shopify.com/s/files/1/0438/2811/7661/files/58050536161.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_off000097cb.bin
1a00da842a6fc23acf70eb33ecb3722d937ff18b3e015aee8945f851847d541f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97CB 4980 bytes
font_01_sfnt_off0000a8b3.bin
f2b455c2a20d7c09f262abda38c4103bd129dafb13344535520b3f1b2d774ff0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8B3 10956 bytes

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