Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8cd31a04273e1b5…

MALICIOUS

PDF

44.3 KB Created: 2020-11-08 12:09:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 07c06dddc3bf9571b09a1545cfa4f1f1 SHA-1: 42ce2987ccd36bd31620a4971d8a4afb89e8e8f4 SHA-256: d8cd31a04273e1b555e6c0792863a77eca1d7bae983d8723e9afea161321544b
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of a malicious redirector suggests an attempt to lure the user to a harmful site, likely for phishing or malware distribution.

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/aws?keyword=professional+goals+nurse+practitioner+essay In PDF document text
    • https://sizojupitad.weebly.com/uploads/1/3/4/3/134332657/sexozofifutasutuvipe.pdfIn PDF document text
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/4318541.pdfIn PDF document text
    • https://pazijovipa.weebly.com/uploads/1/3/4/3/134327002/15cb02cc10b5d9b.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/27ea8efd8.pdfIn PDF document text
    • https://renefifukidib.weebly.com/uploads/1/3/4/3/134343870/4452aa.pdfIn PDF document text
    • https://wejibuxod.weebly.com/uploads/1/3/0/7/130740202/wibewowidawajus-xetezujekura.pdfIn PDF document text
    • https://siwuxamafovad.weebly.com/uploads/1/3/4/4/134489720/rumus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nagev/maduwiko.pdfIn PDF document text
    • https://pifakimep.files.wordpress.com/2020/11/fododuxuxinoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae8e4eb3-9274-4f08-89bb-924b5a2cf538/2067823227.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db95173f-f954-456f-9140-6bdb2ffc290d/lumix_fz70_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff0351da-4614-41ba-a420-fb88e8df0967/97535268909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3e341ca-7cff-4feb-91c3-8bb274c553e8/niropifavogow.pdfIn PDF document text
    • https://pexabubexofo.files.wordpress.com/2020/11/minecraft_cracked_account_generator.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_off00007066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7066 5284 bytes
SHA-256: 4a070efe1145e865b0ee9670a07220e5b41a92f9f0b7da967d240ecb07d3ad92
font_01_sfnt_off0000827f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x827F 9904 bytes
SHA-256: 81d2623875b3b15dce521864061c314cb9aae4cbbdaf49e218e71cf7bd371c5b

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