Malicious PDF — malware analysis report

Static analysis result for SHA-256 b351093f405d94cf…

MALICIOUS

PDF

47.7 KB Created: 2020-08-16 17:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b179f08e17ecc8a56f738297faf2238c SHA-1: 7f335d23f0f29d7999182b18bcec9502349b9356 SHA-256: b351093f405d94cf766a6ba320dd7226f1c982db45740241205dde09c43b0392
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning technique used to distribute malicious content. The primary malicious URL is https://ttraff.com/pify?keyword=bruchrechnen+addition+und+subtraktion+pdf, which is likely used to redirect the user to a further stage of the attack. The ML classifier strongly supports the malicious nature of this PDF.

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=bruchrechnen+addition+und+subtraktion+pdf
    • http://files.heimler-international.com/uploads/1/3/1/0/131070561/9650110.pdf
    • http://files.childrenscookingclasses.org/uploads/1/3/0/7/130740429/923355.pdf
    • http://files.prooutboard.com/uploads/1/3/0/7/130775018/9dec4b1be7f0.pdf
    • http://files.harpoonreview.com/uploads/1/3/0/7/130776458/fixobuxeda_nekakupo.pdf
    • http://korabim.fulfilledshop.com/uploads/1/3/0/7/130776008/be89ae1c2.pdf
    • https://cdn.shopify.com/s/files/1/0438/7710/5832/files/wexideligazufivapozojel.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8821/files/13612363281.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9345/files/24246955175.pdf
    • https://cdn.shopify.com/s/files/1/0437/4295/3626/files/sobekiwazitulofo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/mexew.pdf
    • https://cdn.shopify.com/s/files/1/0432/2348/2525/files/stochastic_oscillator_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/43621491491.pdf
    • https://cdn.shopify.com/s/files/1/0438/2877/3021/files/71785844482.pdf
    • https://cdn.shopify.com/s/files/1/0428/7106/2684/files/zugevanusijolixemu.pdf
    • https://cdn.shopify.com/s/files/1/0440/6899/5222/files/12771669087.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9010/files/84597556474.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_off000072a6.bin
0f76c5cf46b93c0d7eb353302906b00bcaaef757f6d156acb27647c10346e44a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A6 5464 bytes
font_01_sfnt_off00008530.bin
5d0ac7c04bdd203fa41c643068f9e65b78d3473857a83771eb7bc2c1123cc107		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8530 14156 bytes

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