Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2c371f42a04c58…

MALICIOUS

PDF

41.8 KB Created: 2020-08-11 23:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a85ca34ec52f99da290fd1d7ff262545 SHA-1: e616b300a4db1e4072069a9c9ee55ee8cb074f08 SHA-256: ec2c371f42a04c58fe9b89bdbb2dd6817286f4e21deb4b56e6a9ff9395ec8a22
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The presence of a large link farm suggests an attempt to manipulate search engine results or to distribute malicious content through seemingly benign PDF documents.

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/wb?keyword=papermaking%20science%20and%20technology%20pdf
    • http://xixabe.braemarmensclub.com/uploads/1/3/2/8/132815123/nubela-xujagepot.pdf
    • http://files.capturingmomentsblog.com/uploads/1/3/0/7/130740464/xelomatawa.pdf
    • http://rajot.thorndurham.com/uploads/1/3/2/3/132303382/0fabe6a955354.pdf
    • http://files.donnacronk.com/uploads/1/3/1/3/131398455/2897887.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/nurobapisiri.pdf
    • https://cdn.shopify.com/s/files/1/0434/0596/7527/files/javag.pdf
    • https://cdn.shopify.com/s/files/1/0429/0890/9734/files/editing_documents_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0447/1059/2668/files/58186663811.pdf
    • https://cdn.shopify.com/s/files/1/0428/6991/5814/files/18487769684.pdf
    • https://cdn.shopify.com/s/files/1/0433/9764/4444/files/developing_action_research_design.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/midavupugedizo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3202/6008/files/1828840752.pdf
    • https://cdn.shopify.com/s/files/1/0431/9340/1501/files/55647789137.pdf
    • https://cdn.shopify.com/s/files/1/0441/0903/7720/files/adeste_fideles_choir.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1703/files/kolebabujenuped.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_off00006465.bin
d7b5cefd462de8ad251cbafabbdf1a0a4c20035d15b3524a24687e742e4674ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6465 5736 bytes
font_01_sfnt_off000077c5.bin
33f10c57ec4bbc9cd5c64bccc74aa2c2d7c04943427661f76eefc6d4258f5d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C5 10144 bytes

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