Malicious PDF — malware analysis report

Static analysis result for SHA-256 57055c49aea54ca6…

MALICIOUS

PDF

34.9 KB Created: 2020-08-28 16:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2189996190347c0e18ec5f8ff5c9d022 SHA-1: 039d22298722d4299d53c3b7907cc5ada5ef991c SHA-256: 57055c49aea54ca680465aa6698e7e16a5476036dc80ba58ca35a42ae37cc5cb
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, with one prominent URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Dixie narco manual' and the malicious redirector URL, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to 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/pify?keyword=dixie+narco+manual
    • http://files.fbcmprek.com/uploads/1/3/1/4/131410094/2181f.pdf
    • http://files.runkleguidance.com/uploads/1/3/1/4/131453598/gaxowoleg_mafunej.pdf
    • https://cdn.shopify.com/s/files/1/0436/0817/8850/files/49384963613.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/53551020101.pdf
    • https://cdn.shopify.com/s/files/1/0432/5392/4004/files/quantitative_aptitude_examples_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7589/files/sasekomuful.pdf
    • https://cdn.shopify.com/s/files/1/0438/6534/2117/files/tedoguwapegi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3672/9766/files/85825350510.pdf
    • https://cdn.shopify.com/s/files/1/0429/5449/0012/files/tasoko.pdf
    • https://cdn.shopify.com/s/files/1/0435/1623/1840/files/21138242164.pdf
    • https://cdn.shopify.com/s/files/1/0431/3271/5163/files/zuzagonafuraloredawowaza.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_off00004c11.bin
73560554a45bb374be0cf9b4abc7c1f898f21c4ad8d615943d8e8acc71f2e76a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C11 4836 bytes
font_01_sfnt_off00005c66.bin
6ca62a156eaccdc1dc9e2fd24c403ea85456602a1058e9e285ebc409b879032e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C66 10272 bytes

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