Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a3708e39635860…

MALICIOUS

PDF

65.9 KB Created: 2020-08-29 16:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8678e2af9c5ce7b5573e956eb9dbdee SHA-1: 67368951e5e08ee034f8f9fc03b2aefe03d0167d SHA-256: 28a3708e396358606aa2914f3fc4db4f49a031174955831e1bcd8c5ddd12ef49
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, appears to contain the malicious URL. The presence of a link farm suggests an attempt to lure users to potentially harmful content.

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=autoestima+definicion+autores
    • https://static.usrfiles.com/ugd/b8c837_4e1ad306dfcd4c7594ba4964ccb577ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_3fd14edd0c424e399f80c1a2b0f6c6e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_242e6c7349734ca393bb30bc558cf335.pdf
    • https://static.usrfiles.com/ugd/b8c837_fafeba85272149c8a146bdad6c8026ef.pdf
    • https://cdn.shopify.com/s/files/1/0436/0211/6772/files/7220629352.pdf
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/lokenugonudas.pdf
    • https://cdn.shopify.com/s/files/1/0432/1263/6322/files/nibexizawegi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6277/9295/files/vozuvowixixelus.pdf
    • https://cdn.shopify.com/s/files/1/0439/0027/2792/files/19894484787.pdf
    • https://static.usrfiles.com/ugd/b8c837_65257470cdfa4353843b286775c9c074.pdf
    • https://static.usrfiles.com/ugd/b8c837_4820d587703c45f1bae3d88223922d31.pdf
    • https://static.usrfiles.com/ugd/b8c837_2022151995844827939005307418c717.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_off0000c286.bin
7ab13c823b4c03a5011ed27be1d90414b92541d865751f3b232705ffb8a51d9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC286 5124 bytes
font_01_sfnt_off0000d3d6.bin
6da48ed5f913efaa4b4a5392f921dda974b2c0dcca76d8ab94d78f805eec9132		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D6 11504 bytes

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