Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7eb4c0e2890a40…

MALICIOUS

PDF

40.2 KB Created: 2020-08-29 17:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2145dbeb07d6edc13f0d8bedf4c0ad00 SHA-1: 7cbfc2cf5d71261edf22d8df60aa65ed1e7391a5 SHA-256: 3f7eb4c0e2890a409be7da0fcad2f011de22abf3f562595ca7785d79558a7de0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to 'ttraff.com', identified as a malicious redirector, which is likely intended to lead the user to a phishing or malware distribution site. The document body, though partially corrupted, includes the URL and mentions 'the official guide to the new toefl', suggesting a lure. The presence of numerous links to Shopify-hosted PDFs, while individually benign, contributes to a link farm pattern, potentially for SEO manipulation or to obscure the malicious redirector.

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=the+official+guide+to+the+new+toefl
    • https://cdn.shopify.com/s/files/1/0434/1822/2753/files/86768933801.pdf
    • https://cdn.shopify.com/s/files/1/0429/3227/3319/files/56715301666.pdf
    • https://cdn.shopify.com/s/files/1/0435/8501/1869/files/pepumuwaxivoxikagaromifag.pdf
    • https://cdn.shopify.com/s/files/1/0433/7329/7822/files/sebipidatul.pdf
    • https://cdn.shopify.com/s/files/1/0437/0654/8377/files/kenshi_crossbow_required_skill.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98973723668.pdf
    • https://cdn.shopify.com/s/files/1/0437/9246/6080/files/viven.pdf
    • https://cdn.shopify.com/s/files/1/0444/3914/2566/files/abscesso_renal_tratamento.pdf
    • https://cdn.shopify.com/s/files/1/0445/5481/3599/files/aflac_continuing_disability_claim_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/3675/3570/files/gowatilewuxexi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3152/6557/files/evaporador_de_efecto_simple.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/axios_download_file.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38746106010.pdf
    • https://static.usrfiles.com/ugd/dd4472_2fa3a7c06ef044e181c14975495d0677.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed2fe5c954c0403892702dc696a2b420.pdf
    • https://static.usrfiles.com/ugd/b8c837_c749dd5c56f14dc7ab01b970d0d62785.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_off00005533.bin
a50ebda55827cf391f802e0e0e5d8b6bbbbd49efc8ead526b014106a740587a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5533 5052 bytes
font_01_sfnt_off00006670.bin
b2b50c8d696a8fb1f7bc58e61907c0b4ad2872530946583db82dfe41f5b437bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6670 14820 bytes

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