Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd930ceed7cf340…

MALICIOUS

PDF

58.1 KB Created: 2020-08-05 22:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06dc3246401bfc24af03f61ae3caa951 SHA-1: 4501e0c46398694d52f31fcac1f94f3817e9b49b SHA-256: bbd930ceed7cf3407877517bce8b2cc47c546048c6d31ed8ed4b23d121ddb6ef
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains associated with link farms and redirectors. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to click on these links, which likely leads to further malicious content or exploits.

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=the+bent+twig+isaiah+berlin+pdf
    • http://files.rpdk9history.com/uploads/1/3/0/8/130813979/bison.pdf
    • http://sedudal.ruskcountycatholiccommunity.org/uploads/1/3/0/7/130739616/xolol.pdf
    • http://files.gabrielgould.com/uploads/1/3/1/4/131438570/cefe4.pdf
    • http://files.sampriti.us/uploads/1/3/1/6/131606201/5277009.pdf
    • https://cdn.shopify.com/s/files/1/0432/9648/9632/files/rejosujeguf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8412/files/45884294740.pdf
    • https://cdn.shopify.com/s/files/1/0435/1148/0472/files/44138776650.pdf
    • https://cdn.shopify.com/s/files/1/0436/3943/9510/files/76821950567.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8951/files/42692666440.pdf
    • https://cdn.shopify.com/s/files/1/0434/3106/7813/files/12905855155.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1112/files/vmware_certification_roadmap_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bujebunefevefosilipepeju.pdf
    • https://cdn.shopify.com/s/files/1/0432/7289/6672/files/jagubazewerumebek.pdf
    • https://cdn.shopify.com/s/files/1/0429/6428/7651/files/14143227404.pdf
    • https://cdn.shopify.com/s/files/1/0436/3019/8937/files/nifori.pdf
    • https://cdn.shopify.com/s/files/1/0437/5235/8042/files/vedugo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2554/files/8161899995.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_off0000a611.bin
2a87344a39879e3524135271adf5bede6d98f55e73e0f7befdd3a084875ed8d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA611 5484 bytes
font_01_sfnt_off0000b8c2.bin
5ced61ba2866b47c7697968dc4d1543519b61dd24c0f144ff6051b3a40f09dc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C2 10256 bytes

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