Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c60e362d5c8f700…

MALICIOUS

PDF

40.6 KB Created: 2020-09-08 14:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03cfc52a4f64643c8ffb0d7f534bb0bd SHA-1: 9e7a5e5472aa8f9dc07037db4f8085cddb0113f1 SHA-256: 9c60e362d5c8f7008bac30e56f484470d7163c181f6bd21f6ded1cdd26d84b74
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One prominent link, 'https://ttraff.me/wix?keyword=acute+pancreatitis+diagnosis+guidelines', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a lure to a malicious site disguised as diagnostic guidelines. The presence of numerous external PDF links indicates a link farm or SEO poisoning tactic.

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.me/wix?keyword=acute+pancreatitis+diagnosis+guidelines
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/zawupad.pdf
    • https://cdn.shopify.com/s/files/1/0431/1790/4039/files/74748650407.pdf
    • https://cdn.shopify.com/s/files/1/0435/3500/7893/files/53996276432.pdf
    • https://static.usrfiles.com/ugd/74a852_eeb9c7836bb847fc967801bec09b5041.pdf
    • https://static.usrfiles.com/ugd/338562_e4b449f4cd5e4da2b4349014a9fe7eb1.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f3cfe0583d54cd0b63d2ef6556a1ace.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/31672788206.pdf
    • https://cdn.shopify.com/s/files/1/0448/1312/3744/files/35396758584.pdf
    • https://cdn.shopify.com/s/files/1/0437/0900/5978/files/89440224776.pdf
    • https://cdn.shopify.com/s/files/1/0429/7962/3071/files/conjunctivitis_nice_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/english_grammar_test_for_intermediate_students.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7b30d30360941fc9ee6229c55a5721d.pdf
    • https://static.usrfiles.com/ugd/8b9728_0e46782002114d289e6261e40b7734fb.pdf
    • https://static.usrfiles.com/ugd/28b3f7_e5d87507b777489dab64b486e3472aea.pdf
    • https://static.usrfiles.com/ugd/e4a001_4325e6b3b8b94f2aa471992661c6d10c.pdf
    • https://static.usrfiles.com/ugd/96768c_70593fecf4b94677aabc6390fc5a8a54.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_off0000630b.bin
9c2f6ebbd0a109d7826ae10f7706a63ac3403a0b9cd0a9df82c186fee228c022
pdf-font-stream PDF embedded font (sfnt) at offset 0x630B 5232 bytes
font_01_sfnt_off000074e1.bin
4e369e3ccfc2429d3261e9304dec85c7b0bf190b1924db3d94c1bcc1079f7a84
pdf-font-stream PDF embedded font (sfnt) at offset 0x74E1 9508 bytes