Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5cf7030b7852de…

MALICIOUS

PDF

39.3 KB Created: 2020-10-02 22:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0538e7b5c9985eb72e5e083b41ca5b8f SHA-1: 686d9fbd75a8db0e75706a426f928137d370dbb6 SHA-256: 2d5cf7030b7852de7929da6827516c01dfeedf22613f89d3e997f59b9ef7adb8
124 Risk Score

Malware Insights

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

This PDF document contains multiple embedded URLs, including one pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the malicious URL and appears to be a lure for "blended learning pdf macmillan". The ML classifier strongly indicated maliciousness, and the presence of numerous disposable domain links further supports a malicious intent to redirect 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=blended+learning+pdf+macmillan In PDF document text
    • https://site-1037103.mozfiles.com/files/1037103/kiwexiberonaxopa.pdfIn PDF document text
    • https://site-1036869.mozfiles.com/files/1036869/61312765212.pdfIn PDF document text
    • https://site-1037091.mozfiles.com/files/1037091/12194023392.pdfIn PDF document text
    • https://site-1039925.mozfiles.com/files/1039925/77958458458.pdfIn PDF document text
    • http://gitaxaki.denveralpineclub.com/uploads/1/3/1/3/131380183/2dd306d18.pdfIn PDF document text
    • http://files.bulldogcleaningandrestoration.com/uploads/1/3/1/0/131071043/luzufemodo_jikireluvix_wuvog_feluremi.pdfIn PDF document text
    • http://files.westboroughboosters.com/uploads/1/3/2/6/132682193/gukozavaxel.pdfIn PDF document text
    • http://files.myludingtontherapy.com/uploads/1/3/0/7/130775554/9747077.pdfIn PDF document text
    • http://tavuwazam.pawpularportraits.com/uploads/1/3/1/4/131483067/89a5c6.pdfIn PDF document text
    • http://files.saintcatherineorthodoxchurch.org/uploads/1/3/1/3/131379205/87013637b3f7b5.pdfIn PDF document text
    • https://site-1036874.mozfiles.com/files/1036874/97108176865.pdfIn PDF document text
    • https://site-1036656.mozfiles.com/files/1036656/zujonimagiki.pdfIn PDF document text
    • https://site-1037835.mozfiles.com/files/1037835/91336267192.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C57 5344 bytes
SHA-256: 1c227a00f48280da361cac6f5fec08634699784356c6ab26332b52de7e3646e5
font_01_sfnt_off00006e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E76 10048 bytes
SHA-256: 59ba7cfcc468df2b986c3b82977ea90bb3862e2a6cc0e47e23977bc6a2c82fb3

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