Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9820e451aee1e1c…

MALICIOUS

PDF

47.1 KB Created: 2020-08-02 14:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d99a43fb59245cacd93da802e7793c7 SHA-1: f054381396547fd2c6312819e725a0b11a47588b SHA-256: a9820e451aee1e1c4d90e5e156aa5fdfc6b88c01e4be4d415cfd2833f9d46cba
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=numpy+lu+decomposition'. Another heuristic flagged the document as a PDF link farm, with numerous links pointing to Shopify domains, likely intended to obscure the malicious redirector. The document body, though partially corrupted, contains the malicious URL and other Shopify links, suggesting a lure to external content.

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=numpy+lu+decomposition
    • http://files.glsgroupllc.com/uploads/1/3/0/7/130775387/riwesirilizif.pdf
    • http://files.oliviaclareboutique.com/uploads/1/3/1/4/131455722/8a92bf.pdf
    • http://files.justoblog.com/uploads/1/3/1/4/131482931/b4af58b74f.pdf
    • http://files.healingindiaglass.com/uploads/1/3/1/0/131070911/loguwexiropureme.pdf
    • http://files.thegvassociates.com/uploads/1/3/1/8/131871633/4033179.pdf
    • https://cdn.shopify.com/s/files/1/0431/4038/2882/files/sepiladubud.pdf
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/mumaxevudofe.pdf
    • https://cdn.shopify.com/s/files/1/0435/9625/1304/files/40803714226.pdf
    • https://cdn.shopify.com/s/files/1/0433/0110/9920/files/dozokufagofeguxuwo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sutapazuvonovojikujabera.pdf
    • https://cdn.shopify.com/s/files/1/0432/6883/3436/files/kesudiginibazegubafo.pdf
    • https://cdn.shopify.com/s/files/1/0436/3547/4590/files/89284040098.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5830/files/gixotetinerikunoletomunob.pdf
    • https://cdn.shopify.com/s/files/1/0431/0060/2525/files/95550012977.pdf
    • https://cdn.shopify.com/s/files/1/0431/2779/9969/files/tezaz.pdf
    • https://cdn.shopify.com/s/files/1/0440/2708/4965/files/zezutemusakofiwegoj.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_off00007364.bin
ca6e079bd40d0fd532a1fd5bc90ea80dc833050eb28cb9ab33c466d4bb932a91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7364 4984 bytes
font_01_sfnt_off00008456.bin
b54bb5bb8e642c5ad2e695e58dda304bab95afcd5080be96fa35e7c56b569392		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8456 13760 bytes

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