Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e444f2a7b2a268…

MALICIOUS

PDF

40.6 KB Created: 2020-11-08 06:01:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e507edcb5147d10581bcfb92c2d0954d SHA-1: 7df29582ab040a5d16207078a0b390c2fcfdc4f8 SHA-256: a1e444f2a7b2a2685faa2afd3b87c3939dc06db23876709851c87701f2acbe0b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one directly pointing to a known malicious redirector. The majority of the links lead to disposable hosting sites, suggesting a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, and the document body is largely unreadable binary data, but the presence of malicious and disposable links is a strong indicator of malicious intent.

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/123?keyword=star+wars+vs+battlestar+galactica+copyright In PDF document text
    • https://govenovu.weebly.com/uploads/1/3/4/7/134701044/nubuxigag.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/lejobi.pdfIn PDF document text
    • https://mesifadenox.weebly.com/uploads/1/3/4/1/134108947/5519553.pdfIn PDF document text
    • https://jadimakadafi.weebly.com/uploads/1/3/4/3/134378671/5be0feae7f16.pdfIn PDF document text
    • https://xufuluzigi.weebly.com/uploads/1/3/4/2/134266078/5274208.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/2364120.pdfIn PDF document text
    • https://naletonuve.weebly.com/uploads/1/3/4/3/134381452/f6e35d31c9295.pdfIn PDF document text
    • https://lujalidulosegex.weebly.com/uploads/1/3/4/3/134369289/duvofuga_nusudegan_fiwelif_pixegabajowiwum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zigusewune733751328.files.wordpress.com/2020/11/biological_magnification_and_bioaccumulation_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/creative_destruction_hack_pc_download_mega.pdfIn 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_off00005d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8C 5692 bytes
SHA-256: b5ed30c134b8081f7b446432bf2503859c9214b24a8f56eb3d690405ffe67664
font_01_sfnt_off00007103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7103 10900 bytes
SHA-256: 4342c4512abd9333417b069e0d767f868efc63a77d2de508728ef1b8839650e5

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