Malicious PDF — malware analysis report

Static analysis result for SHA-256 830cf137ef46b139…

MALICIOUS

PDF

49.7 KB Created: 2020-08-30 08:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0b8b62f56f18e7713eb0399e50d5769 SHA-1: d8b65159c69e7c21854b52af0c7357e9e91010ff SHA-256: 830cf137ef46b139f2e78bdb10e238de9c34bda9cff1207161c5a0b71a31ff44
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK. The primary malicious URL identified is ttraff.com, which is used in conjunction with a keyword related to numerology to disguise the malicious intent. The document body, though heavily obfuscated, also contains this URL. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious activity.

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=numerologia+karmica+online+gratis
    • https://static.usrfiles.com/ugd/b8c837_61a8fd9d557f4068bb5e783080b20db6.pdf
    • https://static.usrfiles.com/ugd/b8c837_c112fd4767cd431aad59b708858221f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_c03b92a567b24e02867ff4b7cdb0cf4c.pdf
    • https://static.usrfiles.com/ugd/b8c837_3cb4d3dc85054b18a0d286c6c6892292.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c9b3ba46b3143a5a3cb622ac9fb4cc7.pdf
    • https://static.usrfiles.com/ugd/b8c837_498797f69b75420b9030a21ffcf375ea.pdf
    • https://static.usrfiles.com/ugd/3aee12_0361b5d76e2946bf875ae8b9137e47f9.pdf
    • https://static.usrfiles.com/ugd/b77b08_63cd4b11191f4b808974e94a26c40387.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_f1edc0c012dd4297bf60d23575e36c22.pdf
    • https://static.usrfiles.com/ugd/b8c837_70397251cb4b4e688b91709fcbc6f7f5.pdf
    • https://cdn.shopify.com/s/files/1/0448/4271/3249/files/48126236085.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6682/files/vizimiboledujulozu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7076/6750/files/89572052338.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1674/files/26061411140.pdf
    • https://cdn.shopify.com/s/files/1/0433/6818/6024/files/ruvudoxozafave.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_off00006f28.bin
553886228ef76fe131d7322ce41f2bc6bedec51f0c07864c2f49eca71280e4c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F28 6060 bytes
font_01_sfnt_off0000840a.bin
592e008bace66c88c3b9eae14235afd6fd512536e2c411ec31d66d7c0d9e767e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x840A 5152 bytes
font_02_sfnt_off00009581.bin
68291b16e2e43b5ad5f60a2452d4a294bad70cd7d17b0bb17962849f46871d1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9581 10488 bytes

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