Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86f43dff7dd931f…

MALICIOUS

PDF

56.4 KB Created: 2020-10-25 10:11:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: cf8423fbce4a8ac34dc144fa659b8029 SHA-1: 25878fbf547bd443efa9693fd1abb9db7d6f7c4f SHA-256: f86f43dff7dd931f4ea0810af9221e4ca99c85c2791dfc7c20969c67135b7381
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One of the primary links directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://cctraff.ru/123?keyword=gmat+exam+questions+and+answers+pdf', indicating a lure to disguise malicious activity as legitimate content. No scripts were extracted, but the presence of malicious links and the link farm structure strongly suggest an attempt to drive traffic to malicious infrastructure.

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://cctraff.ru/123?keyword=gmat+exam+questions+and+answers+pdf In PDF document text
    • https://diboboxu.weebly.com/uploads/1/3/4/3/134330346/1795867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373753/normal_5f89af044cda4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_5f8aba34eef96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403273/normal_5f90f11fbd962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376103/normal_5f911a0400ee5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393197/normal_5f8f51df64440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_5f94c7eb1fc55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5f8a5beb35cad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/decea2ac-3e02-43b5-b045-c171cb0bb144/29834092983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/124fb0fd-3f8c-489b-a7e7-cf5aeeb49bf3/eddie_guilty_gear.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c6d35fb-fec9-4dc0-ba74-e48003cc70a5/sojukodudavepafin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b35370ea-0b90-46e1-9696-145c4d57c959/84581527090.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43eeff13-59f8-49c5-af70-e3413078c84d/8783291524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a3930b-f614-4367-8159-3bc20a761c8a/wegewivikidetodibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d2814fa-b45a-4e86-b032-0bceeef8043f/19496523505.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2899/1130/files/warehouse_officer_job_description.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/9809/9878/files/stretching_and_shrinking_7th_grade_math_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/3678/4812/files/raft_survival_android_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBF 14208 bytes
SHA-256: 136de67ef66e906fdc2fc023372295872ef957f1d75fcbf55f174a6f4c592a58
font_01_sfnt_off00009df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DF9 5472 bytes
SHA-256: 80031dee1ae32113bf04b67f049e6617e0c03c1d4443d987c1350ffc729bfad3
font_02_sfnt_off0000b090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB090 10340 bytes
SHA-256: b04b98325f4ecda04a24419a08d3138f5902d342d158e61ca76821c5da1acadd

Open this report in the interactive analyzer, or submit your own file for analysis.