Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cab34819fc58801…

MALICIOUS

PDF

51.2 KB Created: 2020-10-02 05:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4487ac78bafb0f908035dcb42bfa088f SHA-1: 5941f345bc34fcaddeb5ed683379c793188f8efd SHA-256: 0cab34819fc58801193a656a0a21e0c97b1f50f14890cf9a961b6079613338de
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, https://gettraff.ru/strik?keyword=best+resignation+letter+for+security+guard, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=best+resignation+letter+for+security+guard In PDF document text
    • https://site-1040238.mozfiles.com/files/1040238/sonigopoko.pdfIn PDF document text
    • https://site-1038679.mozfiles.com/files/1038679/vufagiwijumekuwekelumefu.pdfIn PDF document text
    • https://site-1036786.mozfiles.com/files/1036786/zeroferefujarugaxogagin.pdfIn PDF document text
    • https://site-1037215.mozfiles.com/files/1037215/38072172476.pdfIn PDF document text
    • http://rimiwu.dolphinsinternationalschool.sch.ug/uploads/1/3/1/3/131380969/3333376.pdfIn PDF document text
    • http://files.flocktonchurch.org/uploads/1/3/0/7/130740069/8525101.pdfIn PDF document text
    • http://files.wetnosespa.com/uploads/1/3/0/8/130874350/1251829.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/feac6ece-a1b8-40c0-a718-c272bf67ba6b/zuxilobokogiter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b2cbe3-0d65-4a83-9fbd-8eb0812a10a3/6040078269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5cf66d7-1a22-4115-8d92-549a76d7200d/zewidasujow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/2865/4491/files/yancey_county_register_of_deeds.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7670/5690/files/javogafuwutekokakidiki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5959/0806/files/zijogila.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_off000089ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89EF 5340 bytes
SHA-256: 9a214fbba07e260ee8f5cfd3a62d67d23f7063795a95e7445f6468b989dd9651
font_01_sfnt_off00009c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C34 10580 bytes
SHA-256: 22d55de2991a654990c1f6499a3c24f757085f34512704b0cd7e279dd6ab6726

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