Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a7b6c35775e81a…

MALICIOUS

PDF

42.0 KB Created: 2020-08-31 12:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1779e26e5d488c9ab78ed03a22cfd77 SHA-1: f0f1dd4b1b7373d5bc1356a64c20462f082bfe88 SHA-256: e6a7b6c35775e81a200ff7038fca9be63402e89ba55a7db346de420e076a8291
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, directing users to 'https://ttraff.cc/wix?keyword=relative+pronouns+and+relative+adverbs'. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous embedded links. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the same malicious URL and references to other PDF files, suggesting a coordinated effort to redirect users to potentially harmful 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.cc/wix?keyword=relative+pronouns+and+relative+adverbs
    • https://static.usrfiles.com/ugd/b8c837_0480742dd71943639538b7cb4bedafa8.pdf
    • https://static.usrfiles.com/ugd/b8c837_601bd766f9cf48d49a9be0e25766fe9d.pdf
    • https://static.usrfiles.com/ugd/e4a001_3aac734eb73143269621f20dcd8d99c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_62f5b332f0244a48abd39227e27f300f.pdf
    • https://static.usrfiles.com/ugd/b8c837_dad9782de13042d8bb5f05d20f83d07a.pdf
    • https://static.usrfiles.com/ugd/c618e9_73a0624511f5474281e4c4e964ff442d.pdf
    • https://static.usrfiles.com/ugd/3649d2_e1fc9dd5216a4b33bef723820f217be8.pdf
    • https://static.usrfiles.com/ugd/b8c837_86313ea7cb184f0ea31e33c1249df491.pdf
    • https://cdn.shopify.com/s/files/1/0434/5357/9430/files/rupadare.pdf
    • https://cdn.shopify.com/s/files/1/0431/9418/7933/files/kenazupulisebikuxirogipex.pdf
    • https://cdn.shopify.com/s/files/1/0440/1594/3845/files/case_1840_specs.pdf
    • https://cdn.shopify.com/s/files/1/0433/7562/4350/files/kapozekirevegesigeworoze.pdf
    • https://static.usrfiles.com/ugd/b8c837_78f7a6f0881a4487a911c0985caa0178.pdf
    • https://static.usrfiles.com/ugd/0a51c1_b95e534a411342508a057bece3e7c49b.pdf
    • https://static.usrfiles.com/ugd/b8c837_d05b261dc6324c4b91c9ac9f6ec26692.pdf
    • https://static.usrfiles.com/ugd/270e53_c9f11b033b344ee39fd7cc6677e49036.pdf
    • https://static.usrfiles.com/ugd/38bf1f_5f409978c47e477fb28326c5c4478fb5.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_off00006724.bin
f46dd0d48f6f04929cc64574e7a80215630472fa95311adf68491594f1647592		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6724 5160 bytes
font_01_sfnt_off000078bc.bin
a2f353fc25cf59acc1b7956d829efa73e77a48e4b1aae54a5b9034348a20aba9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78BC 10060 bytes

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