Malicious PDF — malware analysis report

Static analysis result for SHA-256 4831be358f9fd0d3…

MALICIOUS

PDF

49.0 KB Created: 2020-08-30 18:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 315853177ac414e905e7dff5b3369704 SHA-1: 4fb8fd00edbbe19e89b2dbdd4111c03484bb8933 SHA-256: 4831be358f9fd0d3d05dc2f0c5c86ee31e3150a6df90bd356a3df180e6955130
152 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'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of a large number of external links, many benign, indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the malicious link among many others. The ML classifier strongly supports the malicious nature of this PDF.

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=marshall+headphone+major+review
    • https://static.us
    • https://cdn.shopify.com/s/files/1/0432/9085/3534/files/formas_de_absorcion_de_nutrientes_en_las_plantas.pdf
    • https://cdn.shopify.com/s/files/1/0431/1089/1682/files/hallelujah_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/7536/2198/files/58191861318.pdf
    • https://static.usrfiles.com/ugd/b8c837_616489f646b44c4f97f250f1b4d87860.pdf
    • https://static.usrfiles.com/ugd/b8c837_11d8f720be46448fab2bf7f1efaba016.pdf
    • https://static.usrfiles.com/ugd/67e251_7ccea9b907b547f5b569407a2e4833a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_127b7f64e5fe454c97d8858f93b75350.pdf
    • https://static.usrfiles.com/ugd/37321e_2001bda13423425385f2cc2ec7c46a31.pdf
    • https://static.usrfiles.com/ugd/b8c837_25d91c7bdb5b46f9a90f6ebb338b124c.pdf
    • https://static.usrfiles.com/ugd/ae059d_449fddbb31d7496b83840be53de05a01.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd0d0913464c447e8d33514485477726.pdf
    • https://static.usrfiles.com/ugd/a86d68_b692ea61944643c781adbab5fae5434f.pdf
    • https://static.usrfiles.com/ugd/225520_fd669b2f9da140b2a73a8ff242c519db.pdf
    • https://cdn.shopify.com/s/files/1/0432/7106/1660/files/castrol_edge_titanium_fst_0w_40.pdf
    • https://cdn.shopify.com/s/files/1/0431/3533/6616/files/moa_and_aoa_of_public_limited_company.pdf
    • https://cdn.shopify.com/s/files/1/0436/9540/7269/files/15_day_forecast_columbus_ohio.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_off00008203.bin
798dbfcc05489b2f5ac2b3b6cace3ca7fe0f52feb1ae3dd2de2b8d9d21bb702d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8203 5432 bytes
font_01_sfnt_off00009468.bin
974ea6e45c3c1265a698de7ce9a85f85d58ff47fd8359f47551be39fcb51089f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9468 10096 bytes

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