Malicious PDF — malware analysis report

Static analysis result for SHA-256 51652bbd3d8cd5fc…

MALICIOUS

PDF

40.8 KB Created: 2020-08-31 05:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bce1bf4c30975e1050e3d2958645550c SHA-1: 3bb817362fa87da7611c0c2644c6cb7a32f8b88c SHA-256: 51652bbd3d8cd5fc59586cb2ba49c69e1673239d1640fba083f4242f52450720
150 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/wix?keyword=catering+forms+pdf'. This URL is presented within the document body, suggesting a social engineering attempt to trick the user into clicking it. The presence of numerous other PDF links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic, further supports the malicious intent of directing users to external, potentially harmful, content. The ML classifier also strongly flagged this PDF as malicious.

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.com/wix?keyword=catering+forms+pdf
    • https://static.usrfiles.com/ugd/de3d83_d814ebd5f03749baa7606130fb3bafe5.pdf
    • https://static.usrfiles.com/ugd/e7e4a0_b8803e8962c74fb088dea591d45bfd6f.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c72998f81a24045ab070bbb986368ff.pdf
    • https://static.usrfiles.com/ugd/158fb9_e550b479d5a0435d9f97142f6b04c0c2.pdf
    • https://static.usrfiles.com/ugd/b58d21_e0d67ec8c9924bac9edab994bf4174b0.pdf
    • https://static.usrfiles.com/ugd/0d2908_998103bf22da4361b56ac5fa34ffb93e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7bf8c48e0ef7482bb56a3cdecb7b465f.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/20223277194.pdf
    • https://cdn.shopify.com/s/files/1/0429/3584/5017/files/rufizowukeretigevi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/konakamadatusodefogigazez.pdf
    • https://cdn.shopify.com/s/files/1/0465/3269/0070/files/jewigotudivojo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3686/8762/files/22010608905.pdf
    • https://cdn.shopify.com/s/files/1/0469/0522/9474/files/lirilufofoze.pdf
    • https://cdn.shopify.com/s/files/1/0432/1958/3138/files/27763434142.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_off000061fd.bin
9ce5522a09d9c570224e1a0b1a02ee3fb1cbaf4a023a805550ff1f6716ecac28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61FD 5232 bytes
font_01_sfnt_off000073b4.bin
dd7f5936f9cb678e6fe093611f026740f93d5a69d021521b3319371ab9aede3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B4 10284 bytes

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