Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1bba03691f1c1a3…

MALICIOUS

PDF

43.6 KB Created: 2020-08-19 18:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e842a623e32c7f89ede9e524c63f4e28 SHA-1: 92bf3adaf77f3be6750020e7a0ddeb72bea5d997 SHA-256: f1bba03691f1c1a385155e1f75e3bced14fe37854643de9b5ecf36f0bcccd2f5
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at ttraff.com. The document body, though obfuscated, contains the same lure text and URL. This indicates the primary purpose is to redirect the user to malicious infrastructure, likely for further exploitation or phishing. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=best+music+video+er+website
    • http://files.serendipityboutique.online/uploads/1/3/1/6/131636969/1a58dc252.pdf
    • http://migezu.pwcyoga.com/uploads/1/3/0/8/130813834/0584f65.pdf
    • http://files.avocadotoastfinance.com/uploads/1/3/0/8/130815228/8667878.pdf
    • http://files.pulpanddeckle.com/uploads/1/3/2/6/132680922/659f672e0.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1255/files/nimuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61086590007.pdf
    • https://cdn.shopify.com/s/files/1/0440/6345/7432/files/xegenel.pdf
    • https://cdn.shopify.com/s/files/1/0437/4478/8634/files/luvoxepopisifaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/9444/9055/files/55494512017.pdf
    • https://cdn.shopify.com/s/files/1/0431/6764/5852/files/92304375099.pdf
    • https://cdn.shopify.com/s/files/1/0437/1913/1285/files/pawalafoluwokog.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/81049106645.pdf
    • https://cdn.shopify.com/s/files/1/0438/0203/4336/files/vetibonumij.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_off00006db3.bin
8292465f474806d983d496b33d6905f1cc6984728128865f687903ea52751c35
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB3 5184 bytes
font_01_sfnt_off00007f54.bin
e3a5bd5a701e1f05de67f4f514049d26828675474b99b781daa7fcf3adf12936
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F54 10040 bytes