Malicious PDF — malware analysis report

Static analysis result for SHA-256 867bf7057d6fe65b…

MALICIOUS

PDF

45.2 KB Created: 2020-08-30 12:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e98b1d52f5dadabc088046c8f8b31954 SHA-1: 6b3d34eef9fec2367f553de4b453159c8b4315af SHA-256: 867bf7057d6fe65b7e2df45e2cff88ad1f0e2d86c342e2c402262f8f053da389
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised with a keyword relevant to the document's apparent content. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning attempt to distribute malicious content. No scripts were extracted, but the primary malicious activity appears to be redirection to a harmful URL.

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.com/wix?keyword=storyboard+pdf+template
    • https://cdn.shopify.com/s/files/1/0431/4667/4336/files/alanganallur_jallikattu_video_2012.pdf
    • https://cdn.shopify.com/s/files/1/0450/1677/6862/files/simple_employment_contract_sample.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6976/files/24790114572.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7911/files/91367871862.pdf
    • https://cdn.shopify.com/s/files/1/0430/4571/6129/files/43281025424.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1a2616025d9416284fe3cfa05166b48.pdf
    • https://static.usrfiles.com/ugd/b8c837_be0d8509641a4398afbdf57e424f8864.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd4d65ea4f9444d2a5a347f9902067be.pdf
    • https://static.usrfiles.com/ugd/30e015_1fb0911e2e4a43e9ac4248796befc53a.pdf
    • https://static.usrfiles.com/ugd/ce5d00_aadb3f031fa2425885b102e789cbf17f.pdf
    • https://static.usrfiles.com/ugd/865d50_8a1dd632db2a4124be11354e5b113662.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4383/files/cardiologia_livro.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51220099535.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/77695453114.pdf
    • https://cdn.shopify.com/s/files/1/0436/7699/1653/files/70851560495.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000650d.bin
b78018a8e25014dfffd2ebc2240ab2b0b3aff5f9f6c884a41c9785b1c0d8a765		 pdf-font-stream PDF embedded font (sfnt) at offset 0x650D 4988 bytes
font_01_sfnt_off00007606.bin
2fe5da8598dad8ad9c7bece8c7684acb2b47da973d801fa28bd5c43f613292be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7606 10412 bytes
font_02_sfnt_off000099bc.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99BC 4324 bytes

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