Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a85e07547b6fc2…

MALICIOUS

PDF

49.2 KB Created: 2020-08-15 03:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0671e5048305cee65252216e866f789 SHA-1: 541010cd98dba3315db9b2e3962abd98097b141e SHA-256: c9a85e07547b6fc26b0bc2b41af6fe564ef783b97d5fd2d429d6bfe88b91e8e6
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This link is presented in the document body and is designed to trick the user into downloading a file. The PDF also contains a large number of external links, many of which point to Shopify domains, suggesting a link farm for SEO poisoning or to obscure the malicious redirector. 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=easyanticheat_x64.+dll+far+cry+5
    • http://files.drivesmartweldcounty.org/uploads/1/3/1/4/131453969/totudijosusewologili.pdf
    • http://files.gbcdecatur.com/uploads/1/3/2/7/132740892/lavek.pdf
    • https://cdn.shopify.com/s/files/1/0430/9647/3749/files/rugenibaruvo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovaje.pdf
    • https://cdn.shopify.com/s/files/1/0432/4756/7010/files/biosintesis_del_grupo_hemo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9521/1680/files/93115309636.pdf
    • https://cdn.shopify.com/s/files/1/0437/6395/7909/files/32865015629.pdf
    • https://cdn.shopify.com/s/files/1/0430/8280/9508/files/xuzunoxupejakiwujoboli.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/quality_assurance_documentation_in_pharmaceutical_industry.pdf
    • https://cdn.shopify.com/s/files/1/0436/2082/7300/files/tutopupinamedokurofusefe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3665/5259/files/bodumosonorefimo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9462/9788/files/pneumonia_causes_and_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/61882537676.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_off000074f8.bin
222fc56d6d8d314f6a5ef4925d736f2ac3c9eaf6c5583f04a278490325508d90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F8 5664 bytes
font_01_sfnt_off00008859.bin
33944994f4a9b0bc709cfc1a924badc050323586d8d3145654e9f6d75cacb1b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8859 15676 bytes

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