Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f88e3cf9231f56…

MALICIOUS

PDF

34.8 KB Created: 2020-08-30 10:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb2d87f831b3f90547ac896032f22613 SHA-1: 0b85a88878b0a69a76db6b0397a12d12f2acd03e SHA-256: 99f88e3cf9231f56939ba4dcbf5fd9474dd402ba26dd8c4a0169dcad8bb2f977
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. One of the primary links points to 'ttraff.com', which is flagged as a known malicious redirector. The document body also contains this URL, reinforcing the malicious intent. While many links point to benign Shopify URLs, the presence of the malicious redirector is a critical indicator.

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.com/wix?keyword=forcepoint+ngfw+demo+download
    • https://cdn.shopify.com/s/files/1/0430/8844/5589/files/winrar_for_mac_10._6._8.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/41468157016.pdf
    • https://cdn.shopify.com/s/files/1/0460/7587/1396/files/80658692537.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/staxel_dedicated_server.pdf
    • https://cdn.shopify.com/s/files/1/0433/7614/8643/files/da31_fillable.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7654/files/kogod.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3910/files/80032338699.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_752d016577e64e87b39190ddd8737931.pdf
    • https://static.usrfiles.com/ugd/9e41f0_23a155f3adb249ed919e5cd903684dff.pdf
    • https://static.usrfiles.com/ugd/10b11f_cd46d1dcd192499c80e82ab2d109dbf2.pdf
    • https://static.usrfiles.com/ugd/7603ae_914b928e8236402a8c8506efaa2797ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8cb6a49217443a2bd38dc59a5914f8a.pdf
    • https://static.usrfiles.com/ugd/b8c837_7257fe6e0ff84f8d828c00303559191e.pdf
    • https://static.usrfiles.com/ugd/b8c837_370d3142b2dd427b91091a4ecdfb54ec.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_off00004b64.bin
b2b368fd8fa145d714a4e5c500a0b45f8d215637326668d5f56bd3dea11f52e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B64 5344 bytes
font_01_sfnt_off00005d8e.bin
3a2cdabc9059f2cd3c537ee364b0daa863c5d86c664284c5cc07f7089adf1e68
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8E 9672 bytes