Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19951007395d2ee…

MALICIOUS

PDF

47.5 KB Created: 2020-10-15 02:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 26d5e462c52b5257e4fc1c7dce0f8e00 SHA-1: 748663b04610e1396f9f480e49e7443eb2bf5f5f SHA-256: d19951007395d2ee4eb1afdeb4517790539206e9f9f721ca8641530acaff9b74
184 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous embedded URLs. One of these URLs, https://cctraff.ru/strik?keyword=types+of+joints+in+electrical+pdf, is identified as a malicious redirector. The document's content, though obfuscated, appears to be a lure to disguise the malicious intent of redirecting users to potentially harmful sites. The ML classifier strongly supports the malicious nature of this PDF.

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://cctraff.ru/strik?keyword=types+of+joints+in+electrical+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f87650bee68f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_5f87704db5420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f87155fc62eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f8768be7cb8e.pdfIn PDF document text
    • https://site-1040977.mozfiles.com/files/1040977/zadire.pdfIn PDF document text
    • https://site-1041845.mozfiles.com/files/1041845/93823843217.pdfIn PDF document text
    • https://site-1036637.mozfiles.com/files/1036637/53218464708.pdfIn PDF document text
    • https://site-1039278.mozfiles.com/files/1039278/66928605931.pdfIn PDF document text
    • https://site-1040528.mozfiles.com/files/1040528/fitisakadala.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/lomewenidududibimib.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/kizerapu.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/zikarab.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/dec838bc8.pdfIn PDF document text
    • https://rolosakuzorega.weebly.com/uploads/1/3/1/3/131379035/jetapotud.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/1/0266/8530/9103/files/6836743987.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7039/7352/files/checkpoint_firewall_architecture.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5952/8355/files/skyrim_fire_breath_or_frost_breath.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/734644f3-7b5b-474d-af67-c1572202303f/pesabagizosedejezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ca3d7b-e1a2-4cbe-8d5c-e4995d456ba1/56838785495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1315592d-673a-48f3-a70e-726db0e85380/54408548504.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_off00007b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B41 5276 bytes
SHA-256: f9634e35f35045bdf0960b9d9b5cfb8bd7d2fd4d6f003261bc37580817ef9e1d
font_01_sfnt_off00008d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D50 10212 bytes
SHA-256: 56b274bb0120e80fcee4dbdf328db9759ce7147f6c322ba96f263b79f3802ea1

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