Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ecb7c730bd429d…

MALICIOUS

PDF

52.6 KB Created: 2020-09-01 10:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 380784297304ca8807f3942248998162 SHA-1: 4b93d92b891b3e75ba8f0575df76b5595939104b SHA-256: 78ecb7c730bd429d749884b68b3f4251ddf504ca764ff63aba4aab1ab7b89c89
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.cc, which is a strong indicator of malicious intent. The document body, though heavily obfuscated, contains text related to a 'Cocker spaniel haircut guide' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious link. The presence of numerous external PDF links, many pointing to Shopify, further supports the link farm heuristic, indicating an attempt to manipulate search engine results or distribute content through seemingly benign platforms.

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/wix?keyword=cocker+spaniel+haircut+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5913/5132/files/46380527345.pdf
    • https://cdn.shopify.com/s/files/1/0428/3446/0828/files/10262691234.pdf
    • https://cdn.shopify.com/s/files/1/0429/8529/1937/files/6819014430.pdf
    • https://cdn.shopify.com/s/files/1/0431/7439/6058/files/47227237180.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6467/files/67490029215.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f3c77502bd8481685a7886b86258d2a.pdf
    • https://static.usrfiles.com/ugd/60933b_da0b65b6bf214bf4bb46e13bfeb6fb99.pdf
    • https://static.usrfiles.com/ugd/b8c837_1120cf36c456447ea4535e950cd98174.pdf
    • https://static.usrfiles.com/ugd/b8c837_58cb417fc5a44158927dfaadcf54042e.pdf
    • https://static.usrfiles.com/ugd/c1615c_5c39398a204346b8913c94f462dfceec.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffa8688089a64fd181585a1459adc7e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_39e6caa1872b43a28dbce8683b806f40.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce9fe9742dad456c8961b1dc3fe4173d.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f08.bin
8b72495f9b209e329d6bfea9b8d35bb3921c6e11324747487631ad4f16f4c1ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F08 5304 bytes
font_01_sfnt_off0000a107.bin
e3f71d3f46f17e999fb3cea666a74c207b8aea5fd3c890f7b360d18fb11dc095
pdf-font-stream PDF embedded font (sfnt) at offset 0xA107 10736 bytes