Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb962c8f964bfc68…

MALICIOUS

PDF

44.0 KB Created: 2020-10-28 04:31:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4b6c40794d0f7ebbbb9c576a44ec377e SHA-1: 2001421b410892c9edb9d2adb926992f23108845 SHA-256: fb962c8f964bfc6865d82f4845ae869ff276d4363506e2d8817fd0476e246286
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=technical+writing+a+practical+guide+for+engineers+and+scientists+pdf In PDF document text
    • https://bujupovira.weebly.com/uploads/1/3/4/4/134472582/baa642a00.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/5110266.pdfIn PDF document text
    • https://wozuwonasanava.weebly.com/uploads/1/3/1/4/131483955/nafikekopajime.pdfIn PDF document text
    • https://gavawujag.weebly.com/uploads/1/3/4/3/134370084/vejok.pdfIn PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/pofej.pdfIn PDF document text
    • https://nozudasukexip.weebly.com/uploads/1/3/4/4/134441991/pagilobomoxixasel.pdfIn PDF document text
    • https://guferewefozitak.weebly.com/uploads/1/3/4/3/134393558/05e989e32.pdfIn PDF document text
    • https://tenikekiso.weebly.com/uploads/1/3/0/7/130775729/jorotideminen.pdfIn PDF document text
    • https://vewusijonaw.weebly.com/uploads/1/3/4/4/134489037/nefuzuwalawivalev.pdfIn PDF document text
    • https://najuxobetejip.weebly.com/uploads/1/3/4/2/134265875/boforupevubisazataf.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/58954.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/laresisif_kigadebokenub_bajutinerid.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/bikotegegoxaxobeti.pdfIn PDF document text
    • https://nitaluba.weebly.com/uploads/1/3/4/3/134348735/d246051.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/sepixivisedijapafe.pdfIn PDF document text
    • https://navubenawegef.weebly.com/uploads/1/3/4/3/134320789/2dd9075faa.pdfIn PDF document text
    • https://fipuvulozubonoj.weebly.com/uploads/1/3/4/3/134313175/gemazavomikoka.pdfIn PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/4300109.pdfIn PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/lozasuwexekizis-wewozugegi-doriruruze-fagowawe.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/997cbf5025e.pdfIn PDF document text
    • https://dojufewuwi.weebly.com/uploads/1/3/4/2/134235401/femenekujezixirodu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f8984b83f5c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f93e75a58cfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_5f939a15e56ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00006376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6376 2828 bytes
SHA-256: 5fccc4b93669808a911be510fa35354615011d06cae0a9a774c0ef2e9a75b465
font_01_sfnt_off00006d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D80 5456 bytes
SHA-256: 1482706571f8e0636ee6320e10e1b5c69704993cb7a8dbcf2c15b6a87df595b6
font_02_sfnt_off00008013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8013 9628 bytes
SHA-256: ca47ae824260f0bf663afc576e0feb6456f516380413be163736ef607099c252