Malicious PDF — malware analysis report

Static analysis result for SHA-256 d946bed439052ea7…

MALICIOUS

PDF

33.8 KB Created: 2020-10-01 01:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bca0a53f103453fb8b52214c2526ae06 SHA-1: f45425b93b41a6328c131c3e28f72f03d87c8a24 SHA-256: d946bed439052ea716a9fbecfbd9b2d7c27af7b42a33f5fe6761390da1cba8b6
124 Risk Score

Malware Insights

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

The PDF contains embedded links that are part of a link farm hosted on disposable domains, ultimately redirecting to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to trick users into clicking through to a potentially harmful site. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

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://ggtraff.ru/strik?keyword=siyavula+grade+11+physical+science+textbook+download+pdf In PDF document text
    • https://site-1037196.mozfiles.com/files/1037196/74880929948.pdfIn PDF document text
    • https://site-1036851.mozfiles.com/files/1036851/38867494801.pdfIn PDF document text
    • https://site-1036824.mozfiles.com/files/1036824/falomuxifexu.pdfIn PDF document text
    • https://site-1036629.mozfiles.com/files/1036629/96954308141.pdfIn PDF document text
    • https://site-1037124.mozfiles.com/files/1037124/kuxojelodaxizemuku.pdfIn PDF document text
    • https://site-1038768.mozfiles.com/files/1038768/43906523020.pdfIn PDF document text
    • https://site-1037191.mozfiles.com/files/1037191/jujerepunodumumigenazupi.pdfIn PDF document text
    • http://furug.thekairestaurant.com/uploads/1/3/0/8/130873927/pemaniwibuzuwebes.pdfIn PDF document text
    • http://dexap.kelsey-harrison.com/uploads/1/3/2/6/132682646/9768497.pdfIn PDF document text
    • http://files.salujainsolvencysolutions.com/uploads/1/3/0/7/130739182/5917772.pdfIn PDF document text
    • http://files.fiteducationconsulting.com/uploads/1/3/1/4/131454238/89520.pdfIn PDF document text
    • http://suriraz.basilyates.com/uploads/1/3/1/6/131606457/623440.pdfIn PDF document text
    • http://files.bishopkemperschool.org/uploads/1/3/1/0/131070520/xawaxexenul_lusojo.pdfIn PDF document text
    • http://files.dyband.org/uploads/1/3/0/7/130776063/xunural_xunigan_vaxuxi_dokanikasurolen.pdfIn PDF document text
    • http://files.dodiaspora.org/uploads/1/3/1/6/131637308/1885488.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_off00004521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4521 6096 bytes
SHA-256: 6a91b4e8840fb7c4bd9c05642fae14cd40080185cb830859c7c43c7b4ced7997
font_01_sfnt_off00005a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A00 9272 bytes
SHA-256: 30dbd7817c9a959658c3d2c410ca7f7b17dbe1d16de653ec8e1c9c826ee5fec7

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