Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef3eadaa1ed65cb…

MALICIOUS

PDF

43.6 KB Created: 2020-08-30 04:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9ba78ce5726fc414b077780147a41f7 SHA-1: db0d4cb010dbd1925ac3d6a2283fc83be6285c7d SHA-256: bef3eadaa1ed65cb930d1cc4978407023931f06859d63ecf98508222972bd5c8
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/wix?keyword=sign+language+chart+words', which is flagged as malicious. This suggests a phishing or scam attempt where the user is directed to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=sign+language+chart+words
    • https://cdn.shopify.com/s/files/1/0432/6057/5912/files/79637508912.pdf
    • https://cdn.shopify.com/s/files/1/0434/6540/8662/files/21129949145.pdf
    • https://cdn.shopify.com/s/files/1/0440/8701/7637/files/cancer_de_estomago_sintomas.pdf
    • https://static.usrfiles.com/ugd/3aee12_cc6a3a53e1864b00af870a5f1f1fd35a.pdf
    • https://cdn.shopify.com/s/files/1/0435/6662/9032/files/tratamiento_balanitis_candidisica.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/benefits_of_computer_virus.pdf
    • https://cdn.shopify.com/s/files/1/0439/2209/6283/files/azar_hack_version_apk.pdf
    • https://cdn.shopify.com/s/files/1/0430/0881/9349/files/89515757122.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/mala_absorcion_de_carbohidratos.pdf
    • https://cdn.shopify.com/s/files/1/0438/0629/4176/files/angularjs_2._0_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/8105/6935/files/lewasifazijogaxeke.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_off00006a21.bin
9f90b3599d0ed834639bd71e9e4bca6d3050cad6dfd1f5bbc800494d01d5f3f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A21 5396 bytes
font_01_sfnt_off00007c78.bin
f8245a7693f1781b51979b1defa7b134533b8124b0b09aadf48982ac24eaf301		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C78 11140 bytes

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