Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fd405ab50e5510…

MALICIOUS

PDF

46.1 KB Created: 2020-07-30 09:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee918a09d9e58927140e4c82206d2b49 SHA-1: cfc4e77994e54703f80377015f68392281d50c60 SHA-256: 77fd405ab50e55104a85d9f9c002d9dd167795a1a5e1373804ee1ba6b11c010b
154 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a larger malicious campaign, likely initiated via spearphishing.

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/pify?keyword=apostila+auditor+fiscal+tribut%25C3%25A1rio+municipal+pdf
    • http://files.kashmirhouseboatsonline.com/uploads/1/3/1/3/131380875/8474381.pdf
    • http://files.allstaresher.com/uploads/1/3/2/6/132682327/xepojutiteven.pdf
    • http://files.dadsluncheonette.com/uploads/1/3/0/8/130813524/luvevewe.pdf
    • http://files.entreleadgroup.com/uploads/1/3/2/6/132696210/9746920.pdf
    • http://files.idelivereverything.com/uploads/1/3/2/6/132680813/b153611ea08a6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/36392913271.pdf
    • https://cdn.shopify.com/s/files/1/0429/6038/8252/files/31915502466.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5479/files/wekoroxibugabajawej.pdf
    • https://cdn.shopify.com/s/files/1/0432/8387/3942/files/xutago.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/kowopubolimitabikaxabaf.pdf
    • https://cdn.shopify.com/s/files/1/0437/2935/4917/files/fimusekukupivov.pdf
    • https://cdn.shopify.com/s/files/1/0427/4028/5607/files/pubitonazugovukojopome.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22650439267.pdf
    • https://cdn.shopify.com/s/files/1/0433/7978/5886/files/sedepowimawazetifariz.pdf
    • https://cdn.shopify.com/s/files/1/0437/6471/1575/files/datibututakabezulogoborug.pdf
    • https://cdn.shopify.com/s/files/1/0435/3196/0474/files/18436407181.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/runuwadobona.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_off0000727f.bin
cb1bee378ec5abd9ef55c9885f80c9fef61eb493b293baf76302ea8d5f5874ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x727F 5428 bytes
font_01_sfnt_off0000843a.bin
3cf4e1f40038667c798fbd3c8f1388cf1cd0e63a4827474769b6989edcab7c9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x843A 10868 bytes

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