Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c845adf11b9d2e4…

MALICIOUS

PDF

45.9 KB Created: 2020-08-30 14:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e07fc4d30cb2afb13893dd5d4fe4fca SHA-1: 267a5b56e03dfcb076dfcbdcb07005a49e9a537b SHA-256: 0c845adf11b9d2e4d97977028cc70cd89bdea8e719b47d1e1fc5155429100780
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=r%25C3%25A9sum%25C3%25A9+de+la+ferme+des+animaux'. The document body, though partially corrupted, also contains this URL and numerous other links to PDF files hosted on Shopify, suggesting a link farm designed to obscure the malicious destination. The ML classifier also 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.cc/wix?keyword=r%25C3%25A9sum%25C3%25A9+de+la+ferme+des+animaux
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53741046047.pdf
    • https://cdn.shopify.com/s/files/1/0440/1908/9566/files/zefanunun.pdf
    • https://cdn.shopify.com/s/files/1/0429/3859/7539/files/1641109132.pdf
    • https://cdn.shopify.com/s/files/1/0435/0813/8150/files/raja_babu_bhojpuri_song_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0438/0321/3984/files/82947363347.pdf
    • https://cdn.shopify.com/s/files/1/0430/5318/7221/files/archiving_management_system.pdf
    • https://cdn.shopify.com/s/files/1/0429/2981/5705/files/20639177269.pdf
    • https://static.usrfiles.com/ugd/b8c837_f244d413efbd4490a8a22d3cdf270720.pdf
    • https://static.usrfiles.com/ugd/43d598_8f86942a83b24042819cb08d4909eda7.pdf
    • https://static.usrfiles.com/ugd/353d00_654768e92c36481da0f4eb1f9e516562.pdf
    • https://static.usrfiles.com/ugd/8acad3_664f5203f52943149629485fc48596df.pdf
    • https://static.usrfiles.com/ugd/b8c837_441e3a808b99455dab9bd83af84f3a4f.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/2293724218.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977390730.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064b3.bin
d14dff28bb12eb30a1a202f970b2f8193803c512822022a42fefb7bb4de87b42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B3 4964 bytes
font_01_sfnt_off00007527.bin
c5223450519194cb4687697654a45fd26e082c2827fe6726976f0687134ba5f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7527 12012 bytes
font_02_sfnt_off00009aab.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AAB 4324 bytes

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