Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4bb3535ab61515…

MALICIOUS

PDF

40.5 KB Created: 2020-10-31 22:26:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 025a6f04326695ae9eeb23ebd045eef4 SHA-1: 19134d1647d0c69a7c69bf9cbe08125972bf4409 SHA-256: 1b4bb3535ab615154b00fcc7dfd281c9d685e887ac1fdd80c4a71d84aedc6407
94 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL, https://cctraff.ru/strik?keyword=doodle+jump+unblocked+games+66, is identified as a malicious redirector. The document body also contains this URL, suggesting it's the primary lure. No scripts were extracted, but the presence of a malicious URL strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/strik?keyword=doodle+jump+unblocked+games+66 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f895ae911602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423700/normal_5f9c3ccb61719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f874384936e0.pdfIn PDF document text
    • https://faxitovi.weebly.com/uploads/1/3/4/3/134379512/031aebaae83fa8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_5f988bf8307f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1687/9780/files/hindutva_and_national_renaissance_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f10f7b9-3d93-4fcd-b359-46571867a421/27088209835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04884baa-30fe-4200-8f38-9bb45bf91d35/pewis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/0796/4870/files/94382544379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a92711af-87a0-486c-bbce-41b57dbf2d62/zivowobexuteporilo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8885/3186/files/womb_music_heartbeat_baby_monitor_instructions.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_off00005d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D85 5732 bytes
SHA-256: cf929b47e60979c191bc1bf40b15455ee66db9b74e4c358a1759875c8f4c7974
font_01_sfnt_off000070f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70F9 10800 bytes
SHA-256: 1afb3004d9c38e0952a19e548ea54e5097bce1b2d30baca3b32729f1c095d79c