Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e2f8bf7aaf51abd…

MALICIOUS

PDF

34.6 KB Created: 2020-07-31 22:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4184b4a903efcc7ac6598b3eec73fcb9 SHA-1: 8fe8a5a3cd3bc56ca419a0513a84a0ae85b53173 SHA-256: 6e2f8bf7aaf51abd8a4997735e8005acbb2d217313dcbfddbac57078f48d35b4
154 Risk Score

Malware Insights

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

The PDF contains a link farm of numerous external PDF files, with one primary link pointing to a known malicious redirector. This suggests the document is designed to drive traffic to malicious infrastructure, potentially for SEO poisoning or to host further malicious content. No scripts were extracted, but the presence of multiple embedded URLs and the critical heuristic firings strongly indicate a malicious intent to redirect users.

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/pify?keyword=jacquees+feel+it+download
    • http://files.happykidscambodia.org/uploads/1/3/0/7/130775918/defanixorodof.pdf
    • http://files.westwoodpubliclibrary.org/uploads/1/3/2/6/132696063/98aa37a563521.pdf
    • http://files.whitemouthriverrec.com/uploads/1/3/1/8/131856743/6df6a8ec97.pdf
    • http://files.lizsandwick.com/uploads/1/3/2/3/132302764/7346280.pdf
    • http://files.ayecanchange.info/uploads/1/3/1/4/131438419/pizefemoseku-togalipabon-riririnexagul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/saran.pdf
    • https://cdn.shopify.com/s/files/1/0430/7602/6522/files/zibedizalopemisus.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/97066049944.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5209/files/nalemiminupivadezikuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/6488/5402/files/2936596051.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/lofilanoberorilis.pdf
    • https://cdn.shopify.com/s/files/1/0434/2113/9096/files/55616381637.pdf
    • https://cdn.shopify.com/s/files/1/0437/6153/3089/files/jefivetalatikilulev.pdf
    • https://cdn.shopify.com/s/files/1/0428/2423/7212/files/kikotupivevodozofodovewum.pdf
    • https://cdn.shopify.com/s/files/1/0435/3861/2378/files/11815467638.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/88204349483.pdf
    • https://cdn.shopify.com/s/files/1/0430/8130/2167/files/90670725801.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7689/files/15700179496.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048ba.bin
cbc296fed835f05e5d66bbecc5fcb06119ff3e751891b5ab9eb799addec4b831		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48BA 5128 bytes
font_01_sfnt_off00005a54.bin
6ed9ec87a475dc0d178e53aff9693dbbe01c6fcf169b3afc073c656d34ff8751		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A54 10328 bytes

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