Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b92aaf89f97b60…

MALICIOUS

PDF

48.6 KB Created: 2020-10-28 10:28:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0bdf43ed3ff440d5dd0d6541381e82a3 SHA-1: 1c32c2c9ec78eb8e63506e975cb8e6397af001d5 SHA-256: f8b92aaf89f97b602a57b40046ac6618d154c5b3c4d61ff4e19cac62df17ea18
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting services and a known malicious redirector. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm.

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=franklin+high+school+mascot In PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/zumajamibapebu.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/3753809d3.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/a63fb.pdfIn PDF document text
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/fowopasala_zusejetotow.pdfIn PDF document text
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/340640.pdfIn PDF document text
    • https://jeluxipofike.weebly.com/uploads/1/3/4/4/134490416/nezunugulovesaji.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/263184.pdfIn PDF document text
    • https://mesifadenox.weebly.com/uploads/1/3/4/1/134108947/5519553.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/8575168.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/787365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_5f89ab9312b0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384835/normal_5f8d0b2a0fcbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5f8b207fd3a09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387698/normal_5f96295d516fb.pdfIn PDF document text
    • https://dojulukasinu.weebly.com/uploads/1/3/0/7/130776790/3252221.pdfIn PDF document text
    • https://tenikekiso.weebly.com/uploads/1/3/0/7/130775729/8512971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_5f8f67961194d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_5f903692412bf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fopalew/25972937806.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/68247803571.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_off00007df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF4 5232 bytes
SHA-256: 0de6291d63c3df8b104265949a149705a78d415109ca5483d0e2a4d5e2a0236e
font_01_sfnt_off00008f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F8E 11052 bytes
SHA-256: a76d83d214cf0d423e24e21733b0fa8c40bccdab0314c6dcef6b0381b919045d

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