Malicious PDF — malware analysis report

Static analysis result for SHA-256 75359bda20f2fad6…

MALICIOUS

PDF

44.7 KB Created: 2020-08-30 00:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5846017b5703ecd8180a698993c5d150 SHA-1: cf007ff00fda2a9c5dbac28255d511bc0fb0f67d SHA-256: 75359bda20f2fad6282ec12b941529f3d939137d0098bb05e2943396a55bb50b
154 Risk Score

Malware Insights

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

The PDF file contains a link farm with 15 external PDF links, one of which, https://ttraff.ru/wix?keyword=oxido+de+manganeso+iii, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to direct users to malicious infrastructure. The presence of multiple embedded links points towards a link farm strategy, likely for SEO manipulation or to distribute further malicious content.

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.ru/wix?keyword=oxido+de+manganeso+iii
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/99afdc_893dca4452f5464ba6b563db1dfdc9b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_38d88a5e05be4ae1b94398722fe55f31.pdf
    • https://static.usrfiles.com/ugd/b8c837_534f01251945428bbf863bea53b52996.pdf
    • https://static.usrfiles.com/ugd/4b68be_bafe83473c5d43078bf03565a8064ab0.pdf
    • https://static.usrfiles.com/ugd/b8c837_26c040140da746da94db7265570021d6.pdf
    • https://cdn.shopify.com/s/files/1/0430/5456/3477/files/xebizalid.pdf
    • https://cdn.shopify.com/s/files/1/0439/6518/6206/files/john_r_taylor_classical_mechanics.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43377474007.pdf
    • https://cdn.shopify.com/s/files/1/0429/7631/3503/files/warhammer_40000_necron_codex_ita.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bf0aa6a44964d9e9b467b3dd839b70e.pdf
    • https://static.usrfiles.com/ugd/b13fd1_e1c0c641ebf646f4b42f4e20c633c3c5.pdf
    • https://cdn.shopify.com/s/files/1/0428/2744/8476/files/kuxiripupo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0844/8919/files/radinukorunisovexaranok.pdf
    • https://cdn.shopify.com/s/files/1/0432/4196/3683/files/binagu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8652/0228/files/75164206882.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a3c.bin
1a78fcde84c2a4b2b83af744c7341975fd0daa58c8d50dcd17ee0957a21a798a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A3C 5112 bytes
font_01_sfnt_off00006b99.bin
5d8c57385d50d25baadfb523f79b2dad74592bb023acbae9c979bab85dba659a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B99 10892 bytes
font_02_sfnt_off00008f51.bin
26d35e1383085e9cb9d4d21dc57af34f690a59e5e018f3061624371f6fe277e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F51 16196 bytes

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