Malicious PDF — malware analysis report

Static analysis result for SHA-256 988fc80f42750ef8…

MALICIOUS

PDF

59.3 KB Created: 2020-10-04 21:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7ae47fcada36f910455176cc8c18e139 SHA-1: d10ee11704e59aa21fbd0318634c754f47095ae7 SHA-256: 988fc80f42750ef8e5bfb5c1bfd555908167aff786f553e794e70b3824df35f0
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable domains and redirector services, indicating a link farm or SEO spam campaign. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic, suggesting the primary purpose is to drive traffic to malicious sites.

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=ejemplos+de+estadistica+descriptiva+e+inferencial In PDF document text
    • http://fobifaw.awstartingfromscratch.com/uploads/1/3/1/4/131407148/mazemaner-risefusapuviz-vilas-gifexutunezejip.pdfIn PDF document text
    • http://talibubor.misslowrieyear8.com/uploads/1/3/0/8/130874431/9190473.pdfIn PDF document text
    • http://files.ctiw.co.uk/uploads/1/3/2/3/132303071/fusujudonilin_vinifewevetil_lanako_sevilatenogavox.pdfIn PDF document text
    • http://sitowe.firesideballoonsforsale.com/uploads/1/3/1/4/131454065/rojekorig-kifed-bovurax-zafalez.pdfIn PDF document text
    • http://files.aventuranursery.com/uploads/1/3/1/3/131383791/wofinofuxo.pdfIn PDF document text
    • http://pesev.tickboxhappy.com/uploads/1/3/1/4/131453109/143dce4be.pdfIn PDF document text
    • http://kejoja.looksbyalia.com/uploads/1/3/1/0/131070590/00ef8ddc1641.pdfIn PDF document text
    • http://gepej.yogadiversityinitiative.org/uploads/1/3/1/4/131437261/laroli_pezogijavamu.pdfIn PDF document text
    • http://files.bizblogdaily.com/uploads/1/3/1/4/131453996/jokuwenevaduv.pdfIn PDF document text
    • http://nevogemuv.apaky.org/uploads/1/3/1/4/131437502/1970625.pdfIn PDF document text
    • http://files.bonniekilts.com/uploads/1/3/1/3/131398406/7618967.pdfIn PDF document text
    • http://files.komyoreikidonewyork.com/uploads/1/3/1/4/131453465/fcd1b667.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/1d371914-7c6a-49f0-a65c-f1425962ef67/tufogotevogorubemepaxoz.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_off000090f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90F1 5392 bytes
SHA-256: 045c8e75f09d3e1d56a756345388417bef0d9e08539a2f0ac0faa398c7e3d412
font_01_sfnt_off0000a33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA33A 2212 bytes
SHA-256: df83fe8d5f9ace3a72dd9c2d75ccbac9d07c91155da4b9f3b1af45f3f2e9590d
font_02_sfnt_off0000acb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACB3 15972 bytes
SHA-256: 1744c42bc5ee3d8e923016e09a8896131cd06000a870019abffa37552f5ae173

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