Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a364ba67f055a68…

MALICIOUS

PDF

43.3 KB Created: 2020-08-14 08:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33e0d075bc5b81aa3b33e186ac1c7e9d SHA-1: 04f35e9a29aaca3b102985164285a84edb6793e3 SHA-256: 1a364ba67f055a6895873dd76f99da8ef27bd671c0c7e4f02e6b8ef0eed0a8cc
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and other links pointing to Shopify and various domains, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to click on these links, which likely lead to malicious content or phishing sites.

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/pify?keyword=cassandra+fox+dance
    • http://todefowo.clcduncannon.org/uploads/1/3/0/8/130815017/8257377.pdf
    • http://files.secondarysummerreadingprogram.com/uploads/1/3/0/9/130968950/degijexus.pdf
    • http://files.tusilifestyle.com/uploads/1/3/1/4/131453241/0303cea79f.pdf
    • http://files.fnmiec.ca/uploads/1/3/0/9/130969710/7682567.pdf
    • https://cdn.shopify.com/s/files/1/0433/5976/4634/files/25406484583.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/30129571744.pdf
    • https://cdn.shopify.com/s/files/1/0436/1987/7024/files/15812022281.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/29851883768.pdf
    • https://cdn.shopify.com/s/files/1/0431/7744/3483/files/dikulet.pdf
    • https://cdn.shopify.com/s/files/1/0428/6450/9094/files/41565721766.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7415/files/lesunugopifukujepi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1149/files/13654262605.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9287/files/80663994622.pdf
    • https://cdn.shopify.com/s/files/1/0427/7554/3964/files/teachers_pay_scale_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/dusori.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_off00005e2c.bin
91a48f9f2ea106d53f26e701048f5130db7f8c411dc8713e1dd7bec5b3758ae0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2C 4732 bytes
font_01_sfnt_off00006e3c.bin
5f6c2dd9e2a050ff8561792661f065ea0d90e72476f560434d7c6ab70157b317		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3C 10452 bytes
font_02_sfnt_off0000920a.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x920A 4324 bytes

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