Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c2e85a49941550…

MALICIOUS

PDF

47.3 KB Created: 2020-10-01 10:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ec9d2dec8f13c75a67d229f394c2bb4f SHA-1: 1bee5160c7ab745d7bff0cd2d156f2d3b11e6921 SHA-256: 24c2e85a49941550486deaeb3c406ae3b49e87f9d3f98cc6b8db8672259db306
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to other PDF files hosted on various platforms. One of the primary links, 'https://ggtraff.ru/strik?keyword=bipolar+self+assessment+pdf', is flagged as a malicious redirector. This suggests the document is part of a link farm designed to lure users to malicious sites, 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 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://ggtraff.ru/strik?keyword=bipolar+self+assessment+pdf In PDF document text
    • http://files.ubaentertainment.com/uploads/1/3/1/3/131398129/toroza_zoxawuxofosanur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3439/5295/files/34777361105.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0877/8663/files/early_stage_benign_lamictal_rash.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1720/7971/files/airtex_fuel_pump_e3947m.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6471/1575/files/yamata_fy812_sewing_machine_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4257/8332/files/video_editor_android_gratis_tanpa_watermark.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9522cd58-e09a-45d5-8a88-5140d3d91cad/18995075872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a923d01f-91e4-4991-aba6-3d7840a3ab86/jalifamijubixevun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60311fe5-5d82-4059-b806-5057448b8551/wibelojefupedawajapav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eff5b6a7-c786-42cd-a18c-db7f54c41634/benatasibovotikabar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3ffb272-cb4a-4811-bede-2fee76a6779c/medenuvefeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1fb45be-5017-4bcd-bc54-9a962c43fd8c/87981123641.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCC 5236 bytes
SHA-256: 9b0ceb350537e88c22e17f0f9eb8a4ebba5c847a4b29387f0c4139e67691d697
font_01_sfnt_off00007d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D78 6068 bytes
SHA-256: d8e4b7f44dfb66ea49c7f1cefd345a391fade3fb548cc17de4cdbf151663dabd
font_02_sfnt_off00008d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D29 10316 bytes
SHA-256: f92fbf56173fc481551b532beed3a882d0e6b15fe6db3f990751c57670e030c7

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