Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4388991279495a…

MALICIOUS

PDF

39.3 KB Created: 2020-08-15 02:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b469f5eb1673738c2ba0c5a0113aa334 SHA-1: cea90ae7bc5e8cbdb6b56c9e1892422e4b4985b8 SHA-256: 5e4388991279495aff9397a6bec8bf1a718a6cff0889cc8ecb644e8e680030e3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to PDF editing and download, reinforcing the lure. The presence of numerous links, including one to a known malicious redirector, indicates a high likelihood of this document being used for malicious purposes, likely to distribute further payloads or lead users to 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.ru/wb?keyword=pdf%20file%20editor%20download%20for%20pc
    • http://files.carolinamountainreefs.com/uploads/1/3/2/8/132814306/lanuzibizenub_pimulu_motazosapijulek_jazidodirul.pdf
    • http://rejozoru.margaretwebblifecoach.com/uploads/1/3/1/4/131407995/xanekufe.pdf
    • http://files.stmarkstampa.org/uploads/1/3/0/8/130814466/fexigeregoguviwa.pdf
    • http://munijoj.justicecollaborativeatcornell.com/uploads/1/3/2/3/132303382/nomes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0452/4238/4545/files/add_blank_page_to_foxit.pdf
    • https://cdn.shopify.com/s/files/1/0432/6175/5547/files/python_string_to_float.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/xezegifase.pdf
    • https://cdn.shopify.com/s/files/1/0435/4496/9367/files/pusili.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5237/files/14176488971.pdf
    • https://cdn.shopify.com/s/files/1/0430/7409/3217/files/85878148263.pdf
    • https://cdn.shopify.com/s/files/1/0429/5196/6873/files/13429937479.pdf
    • https://cdn.shopify.com/s/files/1/0430/7710/7865/files/arduino_starter_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zugazad.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/5448624473.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/gatunogotemefibuvosetune.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d12.bin
5d40350b50fbd4f5e4acbf23da53930f4a031a77b347389b1846781185bc34ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D12 5064 bytes
font_01_sfnt_off00006e64.bin
d525639c88b47792dd52b82dee153981cf41f53057e992f331a01661662aaba1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E64 9956 bytes

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