Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7051a2c603b9e4…

MALICIOUS

PDF

53.3 KB Created: 2020-08-08 19:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9be8084752188bbcabff3de5d6b30b98 SHA-1: 638fbe0c878016f66169d24e664afad6d6fe5c3a SHA-256: de7051a2c603b9e4e995d0133be628458de8088ee9071668b231ba90dbce0b07
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded external links, many of which lead to a redirector service. The document body contains text related to 'encyclopedia brown stories pdf' and mentions wkhtmltopdf, suggesting a lure to disguise the malicious link farm. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=encyclopedia+brown+stories+pdf
    • http://files.alexandradecandia.com/uploads/1/3/2/6/132695629/dofux_sotarum_rojeba.pdf
    • http://files.timhaleygroup.com/uploads/1/3/2/3/132302941/kekolunigo.pdf
    • http://lebavoro.seamnc.org/uploads/1/3/0/8/130814328/e1fe747d.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/64874908855.pdf
    • https://cdn.shopify.com/s/files/1/0429/0471/5427/files/favabalerivamexof.pdf
    • https://cdn.shopify.com/s/files/1/0435/8206/2753/files/70205463298.pdf
    • https://cdn.shopify.com/s/files/1/0432/3773/6608/files/dafap.pdf
    • https://cdn.shopify.com/s/files/1/0433/9751/3381/files/28931909271.pdf
    • https://cdn.shopify.com/s/files/1/0432/2351/5294/files/ponamipalupitumidolixa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mojarugalemidim.pdf
    • https://cdn.shopify.com/s/files/1/0428/5559/6198/files/lurubewikowo.pdf
    • https://cdn.shopify.com/s/files/1/0441/4432/8856/files/44936093968.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/59554496318.pdf
    • https://cdn.shopify.com/s/files/1/0433/8135/8759/files/xunoves.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_off00008a72.bin
4ce97e24f46714e2ecd77160a81afe8488617119b26acb74aa7e80544db63de4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A72 5440 bytes
font_01_sfnt_off00009d1b.bin
4db53a333ea4262f5ef2551a99e07ad17a0b0320dec7b9bb5fe817f1b64e06ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D1B 13844 bytes

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