Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b894cc9d56c0925…

MALICIOUS

PDF

41.5 KB Created: 2020-08-29 08:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9c3984fdf41cf8a395dd8400eeceec0 SHA-1: 5d9c9211077110bd9e15ebe8c00733bf18636d6b SHA-256: 1b894cc9d56c0925d8130dfdad25bfcf09cd3f8900a6f9a79c26a22a9a3c0cb7
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a redirector infrastructure. The primary malicious URL identified is https://ttraff.com/wix?keyword=dictionnaire+des+expressions+fran%25C3%25A7aises. The document body, though heavily obfuscated, contains references to this URL and other PDF files hosted on static.usrfiles.com, suggesting a link farm or redirection tactic to distribute further malicious content. The ML classifier strongly indicated maliciousness.

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=dictionnaire+des+expressions+fran%25C3%25A7aises
    • https://static.usrfiles.com/ugd/b8c837_cf60f71e75e84616866dc899ae96b425.pdf
    • https://static.usrfiles.com/ugd/b8c837_6bdce39293c54a7a9f3752d5b4024c03.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e47c7c7d1a6442d8ebdcdc9369fa4d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fb4484087e64ace9d7fdfd0b98e83e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7566470a67f4d2f9b2a0e6f8c7a8f65.pdf
    • https://static.usrfiles.com/ugd/b8c837_003e35e81dc946c1ba58c9c88178ffb6.pdf
    • https://static.usrfiles.com/ugd/b8c837_567d9e98961a4e6f8e0d196a410d7c8a.pdf
    • https://static.usrfiles.com/ugd/b8c837_2892154f766246d3b66d0559a4267bc0.pdf
    • https://cdn.shopify.com/s/files/1/0434/0164/2135/files/mazda_b3000_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/5332/5224/files/ximepob.pdf
    • https://cdn.shopify.com/s/files/1/0437/9308/8661/files/96585399131.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7494/files/funofetoziwesefudepas.pdf
    • https://cdn.shopify.com/s/files/1/0437/2430/8630/files/fijuwapuvefeburuj.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2bea7a2424b4e5a95fd7814cc3b2ccd.pdf
    • https://static.usrfiles.com/ugd/b8c837_8af2958918294897a28c4037d4c9908c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7be3290c59e42d39fbaece658f1d0a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_869a402f47734c04ac545f73a5c694a0.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_off00005e84.bin
bded46c6cab025eb42f5be0f9bf2e4c1aba0dac293e842449704ef37c718c4b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E84 5364 bytes
font_01_sfnt_off0000708c.bin
3be9e1910ce2122eb8201efa90047387cb51fd45abf20043e6842a6aeeb928d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x708C 12212 bytes

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