Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21722d76fdf23b1…

MALICIOUS

PDF

68.3 KB Created: 2020-11-02 08:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: deee111463edf2f88a4b8bc759d14add SHA-1: 5c33b5515667398d6cc1b537b08130ed21d35639 SHA-256: a21722d76fdf23b18cf0d8954a89d7a97dd0a2f77eadb300107b41644ba8dff9
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.com/123?keyword=chemistry+eoc+study+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_5f8ca1cba7d9d.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/5938510.pdfIn PDF document text
    • https://vilemanunopabom.weebly.com/uploads/1/3/4/3/134317174/89351eedd37490d.pdfIn PDF document text
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/3733212.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/101086.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jesidofefe/top_5_unions_in_indiana.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/about_indian_constitution_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/significant_beneficial_ownership_rules_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/ghatna_chakra_history_book_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/beginner_full_body_workout.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/mefodafudewotox.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/addicted_by_zane.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A6 2868 bytes
SHA-256: 4c425cd3afd172a68b30c69b595da17445e8a113d1483ab558ee6f72e02c91dd
font_01_sfnt_off0000bed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED8 5012 bytes
SHA-256: 1f74bcf48d6a1538d84d4bf396cdda68e2cd21f61da0948684ebf9e25a60d47f
font_02_sfnt_off0000cff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF2 11128 bytes
SHA-256: 26568253742e3aa3a281e95c08549a26713dfcb9e1f6c18154c83af161b7c506
font_03_sfnt_off0000f5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D3 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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