Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6e03a23c8f1378…

MALICIOUS

PDF

46.0 KB Created: 2020-08-29 07:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2c43ea6931236d23a67f73433c63353 SHA-1: 6e69b6dee777ecf7d226c1ee8cdef343325c11fc SHA-256: da6e03a23c8f137817fdf44891cfdca0d3be1eb36406b3ee830a057b81fd402e
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying a link to known malicious redirector infrastructure. The document body contains the URL 'https://ttraff.cc/wix?keyword=cuanto+es+un+metro+en+pulgadas', which is likely the initial lure. The PDF also contains a large number of external links, suggesting a link farm or SEO poisoning attempt to increase visibility. No scripts were extracted, but the presence of the malicious redirector URL is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.cc/wix?keyword=cuanto+es+un+metro+en+pulgadas
    • https://static.usrfiles.com/ugd/b8c837_53ad0ceb798c438fa9f6eac2e0efc926.pdf
    • https://static.usrfiles.com/ugd/b8c837_d782272e28024ae292070558a03b5d79.pdf
    • https://static.usrfiles.com/ugd/b8c837_094845c7814e438ebaa00eb5fd5809b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_c40b7f75d40843f795fd81b4eabcf8ef.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2240/files/assert_bula.pdf
    • https://cdn.shopify.com/s/files/1/0432/3901/4562/files/giwuto.pdf
    • https://static.usrfiles.com/ugd/b8c837_4c3db10aacf14b5e8cb2cfbbe9a95f8e.pdf
    • https://static.usrfiles.com/ugd/b8c837_943103b58d194d74873b79a5ddf84f99.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a4f.bin
eccd21ffac2667dab773b30c019a2b2e045c3403aee2ba8c182365cd8da95f88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A4F 5184 bytes
font_01_sfnt_off00006bd8.bin
29437f98ff9bfdb4775c8e4ee53a5acaf04aeba4ebd6b046657cd809ef303505		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD8 13860 bytes
font_02_sfnt_off00009696.bin
e8be64a599b4775abf69106d1ea2a605297721d8ccc8071fb3d67c702b09cfa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9696 16100 bytes

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