Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3cd2dfb8399063…

MALICIOUS

PDF

48.9 KB Created: 2020-08-21 21:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38c8f645c15b2d0808dab75dd04f5c6e SHA-1: 891f86404225b9da02cdf01b900bffa2710968e4 SHA-256: 7d3cd2dfb8399063cb708764ccf8899c79415bd9b45f22f5b2ee85d38c27b9b7
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 of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=bach+prelude+1+in+c+major+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it's designed for malicious redirection.

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.cc/pify?keyword=bach+prelude+1+in+c+major+pdf
    • http://files.magidome.com/uploads/1/3/0/8/130814459/dapupom.pdf
    • https://cdn.shopify.com/s/files/1/0432/9131/2288/files/cape_cod_traffic_report_route_6.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/mefexowiwumijimemerobobe.pdf
    • https://cdn.shopify.com/s/files/1/0437/2578/3190/files/probability_math_genie.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tujekozovazufurujujazer.pdf
    • https://cdn.shopify.com/s/files/1/0434/7520/6294/files/16356810491.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/6380830183.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doxufuvezemog.pdf
    • https://cdn.shopify.com/s/files/1/0433/8181/7505/files/55414539406.pdf
    • https://cdn.shopify.com/s/files/1/0431/1128/4893/files/vifobudipikidaguvofasuj.pdf
    • https://cdn.shopify.com/s/files/1/0437/0769/5258/files/wan_network_diagram.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_off00006c12.bin
970b1e19d97c4f025ca2a24fbe552e4f30dc4b62145e95f9fabb1e8811bfa061
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C12 5392 bytes
font_01_sfnt_off00007e3f.bin
8ed67753b9f715502af0b0df1a585140e1fae6fb3c43089cce96fe79a1a1b866
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3F 10188 bytes
font_02_sfnt_off0000a145.bin
73e2bae015806fcbcea00a5e77fef36cf57312733aebee32ba98308b5ce41d75
pdf-font-stream PDF embedded font (sfnt) at offset 0xA145 16120 bytes