Malicious PDF — malware analysis report

Static analysis result for SHA-256 a835a9b63639a3f4…

MALICIOUS

PDF

41.0 KB Created: 2020-09-01 01:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c09aa20ad985464f930a3c7a9eeac298 SHA-1: bb0088dd7f5110e7e039ec36a70370b7c7fdd873 SHA-256: a835a9b63639a3f40d2636c09e91ab50481dffe4b72f05ba75976fafd2d1c2a5
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used for SEO poisoning or to obscure malicious destinations. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a 'Cisa certified information systems auditor training course' and the malicious URL, suggesting a lure to a phishing or scam page.

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/wix?keyword=cisa+certified+information+systems+auditor+training+course
    • https://cdn.shopify.com/s/files/1/0432/4694/4416/files/61933941661.pdf
    • https://cdn.shopify.com/s/files/1/0431/0014/3770/files/aprender_aperturas_de_ajedrez.pdf
    • https://cdn.shopify.com/s/files/1/0430/0475/6121/files/libenumusatakolata.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/10934273895.pdf
    • https://static.usrfiles.com/ugd/f14cf6_33bf5f66ac594fcf86ba4a7daca8e921.pdf
    • https://static.usrfiles.com/ugd/b8c837_e74b192ddd1b4f3e8f1d9e7986e3cbf2.pdf
    • https://static.usrfiles.com/ugd/cc14e4_734f0573efb9428ca18019f5761fe178.pdf
    • https://static.usrfiles.com/ugd/1be480_153bf0c616034330aaa5ba4a0c865c31.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3db155709a443929afe62fe53a894a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_7bef9d7553bf483db6b99ee3ce34d3a3.pdf
    • https://static.usrfiles.com/ugd/d5415a_200bf7e0e8fa43e8944022b45afb8277.pdf
    • https://static.usrfiles.com/ugd/c0fca2_4b0dadc49517494ea8ec1f67371828d3.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_off00005e64.bin
c8f724bf0b5d9230e6bd23b02432c9272faa0f57497b85da6790eb793f9b1ff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E64 5316 bytes
font_01_sfnt_off00007068.bin
55af447cbd84e0fbd545fdbbb3ac87af7f5368918738d35aca609185512fecb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7068 10744 bytes

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