Malicious PDF — malware analysis report

Static analysis result for SHA-256 b455c102d238ba83…

MALICIOUS

PDF

40.7 KB Created: 2020-09-01 04:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f731cd2d9de60ba10c704053a87c72c1 SHA-1: 3a81e8eced9c76639ff583e9492e85e5c3772b20 SHA-256: b455c102d238ba8392ae3f42dcde4f7bf43a5e157da34ff309f74871c488c2f6
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to what appears to be a link farm hosted on static.usrfiles.com, designed to obscure the primary malicious redirector at ttraff.club. The document body, though heavily obfuscated, contains the URL for the malicious redirector, suggesting the intent is to lure users to malicious infrastructure under the guise of product information. The ML classifier strongly supports the malicious nature of this PDF.

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=split+king+fleece+sheets+for+adjustable+beds
    • https://static.usrfiles.com/ugd/865d50_aea4196bbd5b457e9b33e06be2167454.pdf
    • https://static.usrfiles.com/ugd/0cd019_503649cbe5604db3a4c62757f65862af.pdf
    • https://static.usrfiles.com/ugd/b8c837_927c2bf494ff478d8ebdfe818e39c2e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_463de93d2f4c4289be6300a96b299f5c.pdf
    • https://static.usrfiles.com/ugd/a8ca0f_89a4ba80f09940f1bc4117951265fce3.pdf
    • https://cdn.shopify.com/s/files/1/0429/7831/2355/files/86862741663.pdf
    • https://static.usrfiles.com/ugd/aef5b7_cfc283f0280f48728791322cf5a6582b.pdf
    • https://static.usrfiles.com/ugd/b8c837_0cc87890837f4475ab4774e702dddefc.pdf
    • https://static.usrfiles.com/ugd/e3834b_4d6aba6b96d548a4aa11de25a0f949e1.pdf
    • https://static.usrfiles.com/ugd/9b5f63_3c4ef79553ba46b786e68139a20e66b4.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4231/files/44966965142.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jokopewizemaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9817/files/nexaxomox.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_off00006025.bin
4d37a2cd5df1113f1663bfb8772a58ab6abadf644c1d417a089c8637b3a4336e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6025 5800 bytes
font_01_sfnt_off000073e2.bin
5efd41c6fe59444f8f07c410dfed5e04abb194123cf0853558bffead42f3afbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x73E2 9952 bytes