Malicious PDF — malware analysis report

Static analysis result for SHA-256 0838c7dcbed1dcfd…

MALICIOUS

PDF

42.2 KB Created: 2020-08-31 01:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c79c7fc0d272d59c6161320d8bb8abfb SHA-1: fc5ce599466e9fbffaf350d0587129ab9bb59e97 SHA-256: 0838c7dcbed1dcfd7a5e17906544c8d3d6cb36475ea1caa85dfd71c295ee33e1
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, suggesting an attempt to manipulate search engine results and lead users to harmful content. The document body, though heavily obfuscated, contains text related to a medical condition and the malicious URL, indicating a lure. The presence of numerous embedded URLs, many pointing to Shopify, further supports the SEO manipulation aspect.

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.club/wix?keyword=tratamiento+para+trastorno+mixto+del
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6791/5936/files/37718168617.pdf
    • https://cdn.shopify.com/s/files/1/0435/5322/6913/files/surimofara.pdf
    • https://cdn.shopify.com/s/files/1/0439/2206/3515/files/linked_lists_java.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7592/files/mumofogirudanurififu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kividerinogofigizunewif.pdf
    • https://static.usrfiles.com/ugd/221f3a_8b3bed9b455348c69728f18027ca2f75.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/91018779873.pdf
    • https://cdn.shopify.com/s/files/1/0430/6737/5770/files/4815550468.pdf
    • https://static.usrfiles.com/ugd/cc14e4_912da604f89244bf9a860f48cad870c3.pdf
    • https://static.usrfiles.com/ugd/221f3a_d83bb9e780ac4678a2d8bf77da209625.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_off0000659e.bin
6101d3219cd9bf5ffa0e7870b216654e696480c3d63df5e396c82e609fa46f96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x659E 5124 bytes
font_01_sfnt_off000076eb.bin
6c7dee51a418a9e9ee6d98cf7f745ef0d92b00bc846a1ecdbc4fa733d5d91a2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76EB 11000 bytes

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