Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac23b5ab829e5ad…

MALICIOUS

PDF

42.7 KB Created: 2020-07-31 16:39:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0f68ebd8966f26edc860e64d8b15364 SHA-1: d18c9f1b3f76e11c05219211fdaf36b4d19df22d SHA-256: 7ac23b5ab829e5ad8616dedd5cb581199d820c5b28a2b4629be3ff42bceda575
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The document body, though partially corrupted, contains the URL 'https://ttraff.cc/pify?keyword=npm+most+popular', which is flagged as malicious. The presence of numerous links hosted on platforms like Shopify suggests an attempt to create a link farm for SEO manipulation or to host phishing content. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=npm+most+popular
    • http://files.mahaloyallart.com/uploads/1/3/1/4/131437949/tuvomaga_xogerojodut_rexebowinet_dajaxekejobuf.pdf
    • http://files.scambiocucina.com/uploads/1/3/2/7/132740423/2293443.pdf
    • http://files.teslottawa.com/uploads/1/3/1/8/131871648/c2ad1.pdf
    • http://files.cassandraroseclarke.com/uploads/1/3/1/6/131606756/534c70d020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovetutokukike.pdf
    • https://cdn.shopify.com/s/files/1/0430/7753/3856/files/teduresitexonopa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0709/8529/files/bizarixagunabekam.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0296/files/somubuwoxuzinaxifolu.pdf
    • https://cdn.shopify.com/s/files/1/0436/6001/7814/files/gepape.pdf
    • https://cdn.shopify.com/s/files/1/0432/2725/0848/files/gadujukolen.pdf
    • https://cdn.shopify.com/s/files/1/0431/9097/6673/files/tusukud.pdf
    • https://cdn.shopify.com/s/files/1/0435/5080/2081/files/69947295171.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gidawibozifuniji.pdf
    • https://cdn.shopify.com/s/files/1/0436/1139/0115/files/famexeza.pdf
    • https://cdn.shopify.com/s/files/1/0437/7808/0925/files/gururefixuzaxopa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9846/4661/files/16219586750.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_off0000697d.bin
899005b8eb8d3a955f6d19c2651692d6a8a9b38fb838516f727a1da54b204357		 pdf-font-stream PDF embedded font (sfnt) at offset 0x697D 4936 bytes
font_01_sfnt_off00007a2c.bin
ca02c5b2d764a404e617646d658b6daa2d19cacc62b56859c7cef42f8a559369		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2C 10636 bytes

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