Malicious PDF — malware analysis report

Static analysis result for SHA-256 9134ba555bf27e4b…

MALICIOUS

PDF

40.7 KB Created: 2020-08-21 12:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b030da3d8ef04f48ab9759be33440ef SHA-1: 2ffd10c509cb9c3a13eb3140c1e736f67142b3c9 SHA-256: 9134ba555bf27e4b51a938a013ce29478317e69176aa5222626c46dbda22221e
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a job description template. This redirector leads to a link farm of other PDF documents, likely to obscure the final malicious destination. The ML classifier strongly indicates maliciousness, and the PDF structure is consistent with SEO-based link farming for malicious purposes.

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=job+description+template+word+sample
    • http://vuwepu.customhomemechanics.com/uploads/1/3/0/7/130776262/soxipolugokum-wexolip-kizunivivemuz-lesopajuwuwov.pdf
    • http://rodagix.gmcvsuites.com/uploads/1/3/2/6/132681812/zofazabovarez-kakikadu.pdf
    • http://lixebud.wagassociates.com/uploads/1/3/2/6/132696280/589e726412c8.pdf
    • https://cdn.shopify.com/s/files/1/0430/0963/8553/files/pulse_secure_network_connect_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3362/files/xejirirekoxajimesifa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5326/0701/files/bhagavathi_tamil_movie_hd.pdf
    • https://cdn.shopify.com/s/files/1/0428/5690/6918/files/pichuva_kaththi_tamil_movie_hd_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/vivakavenuxiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6290/files/55130545743.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4515/files/zivewowidotit.pdf
    • https://cdn.shopify.com/s/files/1/0437/8053/8526/files/php_uploading_script.pdf
    • https://cdn.shopify.com/s/files/1/0430/1206/3391/files/suwoli.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_off00006473.bin
9310e22ad26516c7835280b2fe9828ab7099b30822b19d46461606700ebb033c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6473 5440 bytes
font_01_sfnt_off000076df.bin
88b985afbfe27cb4137605936f2d59f9c8d35cbbf1b8c580d5d804abd9b08e76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76DF 9172 bytes

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