Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd768e187921fc29…

MALICIOUS

PDF

41.8 KB Created: 2020-10-07 14:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 351ae9ffc7212789c0570c96b5157ba4 SHA-1: 7a753c6aedfa5b01e41d089eafe113f84e639df1 SHA-256: fd768e187921fc2950934ded4bdda9e91fba411ddf2694f0cd4eddd6518cb35f
124 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 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://gettraff.ru/strik?keyword=%25C3%25ADdolos+do+cora%25C3%25A7%25C3%25A3o+elyse+fitzpatrick In PDF document text
    • https://site-1037019.mozfiles.com/files/1037019/83201567153.pdfIn PDF document text
    • https://site-1036840.mozfiles.com/files/1036840/vufavojeg.pdfIn PDF document text
    • https://site-1040386.mozfiles.com/files/1040386/paloxuzugusam.pdfIn PDF document text
    • https://site-1040263.mozfiles.com/files/1040263/34946801372.pdfIn PDF document text
    • https://site-1043793.mozfiles.com/files/1043793/5867766366.pdfIn PDF document text
    • https://site-1039903.mozfiles.com/files/1039903/75032178623.pdfIn PDF document text
    • https://site-1041950.mozfiles.com/files/1041950/xoverolek.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://uploads.strikinglycdn.com/files/ffcab04f-416f-4f3c-ba0e-8d1a1e91c854/86236667016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5301c691-30a4-47d1-9a68-dea4f3fbcb61/vefusekezemaxemede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd8a7eb8-b9ff-4119-9acc-a4f5e6bf8a60/jazowakurosunegozemamuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e80c054-a827-4651-97ed-2180491810d2/tosinobosavodaxawetip.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_off00004836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4836 2864 bytes
SHA-256: 3c6413ece59eead5f5195ad6f866d9011a1f0120553e5b43acb32bb1e7f4b91f
font_01_sfnt_off00005267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5267 5504 bytes
SHA-256: be62e9c62edecadbf7865c7f2f32bde52ae203bcf5bf41fd1bfc49ce26b750f7
font_02_sfnt_off00006463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6463 12224 bytes
SHA-256: e395696232c06aa5a41d663f5d2c3c57a4b5ba792a5330d0b2e38c7682f99602
font_03_sfnt_off000089e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89E8 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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