Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7fd3c49317096a…

MALICIOUS

PDF

39.2 KB Created: 2020-08-29 17:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 236e4df7e5791a77ddd015e865602499 SHA-1: 3aee2dc9254e9b62aeca4ed069b3c2151dac35ae SHA-256: 4d7fd3c49317096a686064bc4ef7417d14b82b2906321f300dd4acae89fb6f99
154 Risk Score

Malware Insights

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

This PDF document contains a critical heuristic firing for a malicious redirector link, directing users to 'https://ttraff.cc/wix?keyword=exercicios+autocad+planta+baixa+inic'. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to external malicious content. The presence of numerous other PDF links, many hosted on Shopify and static.usrfiles.com, indicates a link farm strategy, likely for SEO poisoning or to obscure the primary malicious destination. No scripts were extracted, but the primary attack vector appears to be the embedded malicious URL.

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=exercicios+autocad+planta+baixa+inic
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/kigabefogageliti.pdf
    • https://cdn.shopify.com/s/files/1/0435/6990/5825/files/titaxak.pdf
    • https://cdn.shopify.com/s/files/1/0431/6325/4944/files/zugewuranudokojoxe.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/24169842478.pdf
    • https://cdn.shopify.com/s/files/1/0437/3381/1351/files/different_approaches_to_operations_management.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f4f8c30bc434cc4970cbe52abca9738.pdf
    • https://static.usrfiles.com/ugd/b8c837_441bc173269a423b8cc0cf9aab728601.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ca733eb7ac848cf887eb8202189f8c1.pdf
    • https://cdn.shopify.com/s/files/1/0429/2509/7126/files/zasivenanorekuwelumo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9917/5579/files/luvib.pdf
    • https://static.usrfiles.com/ugd/b8c837_c24c944a9cb046c1acfeb53a213222cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_02fdf7ef2b034ecda35f0a51f9c8da88.pdf
    • https://static.usrfiles.com/ugd/b8c837_09e163782efa4afaade876bacddeddee.pdf
    • https://static.usrfiles.com/ugd/b8c837_b541c3dd58224a26a8f053fce03d572c.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9a5f1c605a6426e87f9e7d95393b706.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_off00005c3b.bin
5b9ddf9a5e438f0ddf15754a9ede002aed8c653765c3961050eed2199504e911		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3B 5232 bytes
font_01_sfnt_off00006e0c.bin
4a7cf8f6c913767b8afb7daced620118116f256c8d9895c3cdc71df2fde07725		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0C 10044 bytes

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