Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aabf4827ddf9886…

MALICIOUS

PDF

41.0 KB Created: 2020-08-31 11:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0328ade90f48fe81e0f283fa03de170 SHA-1: 6aa34c921a7a536d7081910adefd99c4a95269a9 SHA-256: 2aabf4827ddf98861dc8fed4400c92961998bfec56c085af1c6be9aa08bd0e0b
150 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to Shopify domains hosting other PDFs, suggesting an SEO poisoning or link farm tactic. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.cc/wix?keyword=graphing+sine+and+cosine+functions+worksheet+pdf'. The document body, though heavily obfuscated, contains references to graphing functions and worksheet PDFs, aligning with the lure. The ML classifier also strongly indicated maliciousness.

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=graphing+sine+and+cosine+functions+worksheet+pdf
    • https://cdn.shopify.com/s/files/1/0434/5469/3541/files/35835847860.pdf
    • https://cdn.shopify.com/s/files/1/0433/1683/8553/files/79096454338.pdf
    • https://cdn.shopify.com/s/files/1/0429/4079/2999/files/10163966237.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/43746398923.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/samsung_galaxy_s7_fonts.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sitadekekogog.pdf
    • https://cdn.shopify.com/s/files/1/0434/4994/2176/files/78513258867.pdf
    • https://cdn.shopify.com/s/files/1/0429/6219/0499/files/gosigepoketolabowakil.pdf
    • https://cdn.shopify.com/s/files/1/0434/2094/2486/files/bapogatelobow.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5082/files/91955691825.pdf
    • https://cdn.shopify.com/s/files/1/0433/9433/4870/files/76081070451.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/zasasov.pdf
    • https://cdn.shopify.com/s/files/1/0428/5523/5740/files/tarapuwabonuxuzur.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_off00005da2.bin
733d783b1794e4eb18fa1b49f98e59447a0e69d80c157ff292d80a8a69bc6b82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA2 5572 bytes
font_01_sfnt_off000070aa.bin
6cd91bd80feb3ef3d3e01c56b09c32e359bac56cb97fcc0810c075c9fdf33b88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70AA 10904 bytes

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