Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6621466b93aee1b…

MALICIOUS

PDF

41.2 KB Created: 2020-09-19 07:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f71bd479e9c49d8e67713cf0911217ed SHA-1: 4ea9f4498cf09cbe6bdc0b71a8a0403c7ed16959 SHA-256: c6621466b93aee1ba204db76d47445241c9eefaa6548ca175e32b5e2a0620f72
152 Risk Score

Malware Insights

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

The PDF 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, 'https://ttraff.club/wix?keyword=sonia+ricotti+books'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.club/wix?keyword=sonia+ricotti+books
    • http://files.trucksntools.com/uploads/1/3/0/8/130815026/7539716.pdf
    • http://konebipe.barrsbarsltd.com/uploads/1/3/2/3/132302780/nelajet_muxarazes_wudikafef.pdf
    • http://lavoso.mentertainmentgroup.com/uploads/1/3/1/3/131379874/27efaac34c9b30.pdf
    • http://zuduf.aquinashomeschool.com/uploads/1/3/0/9/130969406/lusibab.pdf
    • http://files.mmeramirez.com/uploads/1/3/1/8/131872286/596220.pdf
    • https://cdn.shopify.com/s/files/1/0433/4875/4600/files/intraday_liquidity_reporting_swift.pdf
    • https://cdn.shopify.com/s/files/1/0440/8557/5832/files/60746483302.pdf
    • https://cdn.shopify.com/s/files/1/0476/5676/3558/files/71251123940.pdf
    • https://cdn.shopify.com/s/files/1/0433/7546/0515/files/76084309876.pdf
    • https://cdn.shopify.com/s/files/1/0429/5737/3589/files/media_player_source_code_in_android_studio.pdf
    • https://cdn.shopify.com/s/files/1/0428/5625/1559/files/gates_belts_cross_reference.pdf
    • https://cdn.shopify.com/s/files/1/0435/4742/6975/files/76241359160.pdf
    • https://cdn.shopify.com/s/files/1/0429/2263/9527/files/93800346984.pdf
    • https://cdn.shopify.com/s/files/1/0436/3105/0905/files/github_create_new_repository.pdf
    • https://3015eb46-0fc5-4673-b3a7-fe61863e49ee.filesusr.com/ugd/64f9d2_c1915e498d06447aa3234bd122f4d02e.pdf?index=true
    • https://9f8d9ec8-596f-445c-aecb-c278ca954311.filesusr.com/ugd/704566_9760421246e94e48b1be35addb34a006.pdf?index=true
    • https://446e52c0-054e-42fc-a047-93d35638014e.filesusr.com/ugd/8bc2a6_df4f240e8b8c420bbe27845162501b50.pdf?index=true
    • 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_off0000657e.bin
cf75ba8f76cc869619f90c2e94bce24b861fa4808d5ffafea3be07ecd733752d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x657E 5068 bytes
font_01_sfnt_off000076c9.bin
abcff412f31f36f2f66829982a9e52b237ae98da793c3a997f0c5e19f1eb9eff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C9 9748 bytes

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