Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4201074a6110969…

MALICIOUS

PDF

43.5 KB Created: 2020-07-08 11:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 00d40df396a46abc111555ea3c139398 SHA-1: a29b30f0444fa517ac36c2c8bd3ef93945dd0464 SHA-256: d4201074a6110969f662cc350e8e87f9b8a0552b995dfe7a15e64bcade262d19
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The primary link, 'https://ttraff.cc/wb?keyword=manual%20prevalidador%20dian%202018', appears to be a lure for users seeking tax-related information, redirecting them to potentially malicious content. 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://ttraff.cc/wb?keyword=manual%20prevalidador%20dian%202018 In PDF document text
    • http://files.nducuwangugi.com/uploads/1/3/0/9/130969555/gimuviri-megatanizus-selusifo.pdfIn PDF document text
    • http://files.montserratcolome.com/uploads/1/3/1/4/131406295/todekelis.pdfIn PDF document text
    • http://files.andreanelson.studio/uploads/1/3/1/8/131871690/b02bc.pdfIn PDF document text
    • http://files.surrenderedtochrist.org/uploads/1/3/2/6/132681656/wulegi.pdfIn PDF document text
    • http://files.desertheartsphoenix.com/uploads/1/3/1/1/131163563/vodewavaguje.pdfIn PDF document text
    • http://files.key2evolve.com/uploads/1/3/0/8/130874318/zasabuxemer_xawapikiguromik_balasoge.pdfIn PDF document text
    • http://files.shopbananababy.com/uploads/1/3/1/4/131453725/vodefogidabizo-mizexoraji-pajug-punijetuwowonat.pdfIn PDF document text
    • http://files.ncam.ac.nz/uploads/1/3/0/7/130776788/a94fe6a1c2f25a.pdfIn PDF document text
    • http://files.kspaceonline.com/uploads/1/3/1/3/131380868/b7e90.pdfIn PDF document text
    • http://files.phoenixnyteachers.com/uploads/1/3/1/6/131606550/c5d82ea10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bowekama.files.wordpress.com/2020/07/muxamirigepidotubuluf.pdfIn PDF document text
    • https://xizipif.files.wordpress.com/2020/07/tegemonebitofafereduvuzi.pdfIn PDF document text
    • https://tamabofupema.files.wordpress.com/2020/06/60690126362.pdfIn PDF document text
    • https://kugolofoto.files.wordpress.com/2020/06/26784466431.pdfIn PDF document text
    • https://xonikamuti.files.wordpress.com/2020/06/26229799514.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6809 5164 bytes
SHA-256: cad74a35c4606f3f719e2f20e092f8c92deb3090580861727fc1bcef9ff2c534
font_01_sfnt_off0000799b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x799B 11792 bytes
SHA-256: c6888f4303f8e63eda1248e0112ae2ab2073723a7b9cc1a6691c4d3f2ca1a026

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