Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f4d5b03f836e16…

MALICIOUS

PDF

34.7 KB Created: 2020-11-01 13:02:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 050191d5394f1559011a383bf4c07068 SHA-1: 607b2bab64a53eb3b3b71476407f287379a7cacd SHA-256: c6f4d5b03f836e167ca6a0ec0a141d46629db923ee439140ffbbcc6c51a617dc
124 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a known malicious redirector, disguised as academic resources. The document body itself is heavily obfuscated but contains the malicious URL. The presence of multiple links on disposable hosting further supports a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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/123?keyword=january+2015+chem+regents+answers In PDF document text
    • https://fewevivib.weebly.com/uploads/1/3/0/8/130813821/xabuxeremulaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367308/normal_5f87520773ccc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_5f8736c51e2f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371248/normal_5f93df73ea317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389101/normal_5f9c3d9fa778f.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/2629586.pdfIn PDF document text
    • https://mufebukevep.weebly.com/uploads/1/3/4/0/134096334/5a4cc5ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426830/normal_5f997d7df3f5e.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/1c4d69.pdfIn PDF document text
    • https://vefozifus.weebly.com/uploads/1/3/4/3/134382693/jadoforejesufutawo.pdfIn PDF document text
    • https://depufavekozumel.weebly.com/uploads/1/3/4/0/134017714/992923.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/kavitokolezub/wakefield_bayesian_and_frequentist_regression_methods.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2028/7639/files/pogudotamunezuxagobume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fafaff60-3ec8-44e4-9185-cf1028fe118e/rokogarexude.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/duck_life_hacked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebffc4ef-b0e0-4100-951f-128f022c12c8/nenokarutibe.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_off0000489e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x489E 5812 bytes
SHA-256: cb1da8e482d270614ceb1e17960a318199506ac913e2dfcf3bccbe00177bd0f8
font_01_sfnt_off00005c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C61 9872 bytes
SHA-256: 7562efd9f98c1fe60944bf3e8adfe913a43d319ce8b18c7c55c6fd92c4d0d478

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