Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbebbb72677938d…

MALICIOUS

PDF

55.4 KB Created: 2020-09-13 01:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00e27f6eda632bbc690e40f4a3ea1337 SHA-1: 2767e8a173913ea54608dc3976fffac1b1655436 SHA-256: 4bbebbb72677938d6cb30ee027e3d0ccbebccb48b0eb028b73ad4371a45016b4
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a redirector URL that is associated with malicious activity, specifically a lure for "bank of internet usa complaints". The PDF also hosts a large number of external links, many of which point to generated SEO PDF links, indicating a link farm designed to attract traffic. The ML classifier 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=bank+of+internet+usa+complaints
    • http://xoved.psignologic.net/uploads/1/3/1/1/131164250/dokajurojitezamapoj.pdf
    • http://files.moritzscience.com/uploads/1/3/0/9/130968968/8d0573.pdf
    • http://rizebuwon.noroydesign.com/uploads/1/3/0/7/130738799/webezuladubupuserek.pdf
    • http://files.friendsofislandviewbeach.com/uploads/1/3/0/7/130775730/sidodujadunijafapuv.pdf
    • http://files.ordernutsabouttella.com/uploads/1/3/1/6/131636890/376ff.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1041/files/deep_ecology_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/8897/7813/files/autobiography_of_a_river_ganga_in_2500_words.pdf
    • https://cdn.shopify.com/s/files/1/0432/8783/8886/files/67146338064.pdf
    • https://static.usrfiles.com/ugd/6924eb_a4d7c693059e4e8ea0d168c3d087fafe.pdf
    • https://static.usrfiles.com/ugd/197ed4_7948d03b306b47c28904498e21a48ab4.pdf
    • https://static.usrfiles.com/ugd/b8c837_362636c542d14cf99d234a49f50086fc.pdf
    • https://static.usrfiles.com/ugd/a4d998_3945d0188dd24e2294bdb8f1075da81c.pdf
    • https://static.usrfiles.com/ugd/35dc59_cb6133fb5c7a47b6a73554a89367ddf9.pdf
    • https://static.usrfiles.com/ugd/536122_ee146b458d9c47d2898d489d68688c00.pdf
    • https://static.usrfiles.com/ugd/b7082a_d419f2a5a02d49ad81cc40636931031e.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_off0000900f.bin
35a57bd4f8af8edbcdfdd9cfcfb231545ec7ea8cc1f4b3598bb5af5d3906a743		 pdf-font-stream PDF embedded font (sfnt) at offset 0x900F 5272 bytes
font_01_sfnt_off0000a1f1.bin
f64f2575ed5302c87c3dc18a5e8b837f6ff7df2746198cd3b97c8839324d2817		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1F1 14872 bytes

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