Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f414bef0be3924a…

MALICIOUS

PDF

41.7 KB Created: 2020-10-28 10:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a9b06e49c1ec3d2bd812452b1dadc94b SHA-1: 961e95f9b972093683d49ea57d65eb4d39884fa6 SHA-256: 3f414bef0be3924a616097e1f8c2822add53b001a0ee357c20c260a90044d9b7
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 of which point to disposable hosting services and are part of a link farm. One of the primary URLs, https://cctraff.ru/strik?keyword=vision+fitness+bike+e3200, is flagged as a malicious redirector. This suggests the document is designed to lure users to malicious sites, likely for further exploitation or phishing.

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=vision+fitness+bike+e3200 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390323/normal_5f906c8618a67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375528/normal_5f951cb545fcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_5f980fc59a1c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f8aac4eda7fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f9438a52da7c.pdfIn PDF document text
    • https://wozofawado.weebly.com/uploads/1/3/0/8/130874325/4a0932.pdfIn PDF document text
    • https://zixotojene.weebly.com/uploads/1/3/4/3/134315054/2726522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_5f943ce904242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5f88015887b41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406775/normal_5f9442b4d9875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376101/normal_5f8e634857c1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408464/normal_5f98cd0f8c3de.pdfIn PDF document text
    • https://tedomidile.weebly.com/uploads/1/3/2/7/132712102/2893753.pdfIn PDF document text
    • https://nakoliveb.weebly.com/uploads/1/3/4/5/134503524/pipanap-rixesu.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/900b0.pdfIn PDF document text
    • https://xonuvalax.weebly.com/uploads/1/3/1/4/131437330/poworuzefilovovep.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/8982451.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/1/0503/8964/7534/files/cours_droit_administratif_special.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0315/8433/files/famuba.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_off000065d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65D8 5028 bytes
SHA-256: fd3d16a8b80bbd01b7db933f8cea83bf14aafaaa002c6ce71b09642fc1125389
font_01_sfnt_off00007712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7712 10252 bytes
SHA-256: d418b70160503c24ec35c67a33983bfd49e953b675af489dbd334d9d2ce943e9