Malicious PDF — malware analysis report

Static analysis result for SHA-256 5baf08ca020fd062…

MALICIOUS

PDF

44.7 KB Created: 2020-11-06 12:56:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50a26cba0db79a7583b7bdb0699cd53c SHA-1: 7f40468e427d7a239bdc71864b83af7475679685 SHA-256: 5baf08ca020fd062406512b36f256a5dc8d47b7117f3fdabb9a132c0c142afda
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various PDF files hosted on external sites, indicative of a link farm. One of the primary links directs to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to malicious infrastructure.

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 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.
  • 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=circle+of+life+worksheet+activity
    • https://jujodupif.weebly.com/uploads/1/3/2/3/132303189/5822144.pdf
    • https://dudabiwik.weebly.com/uploads/1/3/4/3/134354119/zaregupirojiz.pdf
    • https://fozijiruzixusap.weebly.com/uploads/1/3/4/3/134317533/vedud-maxoka-zapamova-wovabut.pdf
    • https://togurekeve.weebly.com/uploads/1/3/4/0/134040335/zemowodarolulej_pevofivoz_josolovifakeze.pdf
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/ramugimexixepaba.pdf
    • https://nenodomamik.weebly.com/uploads/1/3/4/0/134095987/9777099.pdf
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/fejuxi.pdf
    • https://wenilitedosi.weebly.com/uploads/1/3/4/3/134315728/10e0722c77b.pdf
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/xinafaxeki-dekoj.pdf
    • https://vebifejelib.weebly.com/uploads/1/3/0/7/130775119/8740001.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/fcf1fe37-d14e-4548-a126-8a43b54a94cc/sijeluf.pdf
    • https://uploads.strikinglycdn.com/files/5340cc8c-1a26-44b5-a11f-dc31f8eca408/sifojumo.pdf
    • https://s3.amazonaws.com/wuzalugiseto/zokawirixipizobutoji.pdf
    • https://uploads.strikinglycdn.com/files/ae65a601-f9b6-42f6-ad38-fa1103c678f9/viwutalijuvuzuxuni.pdf
    • https://s3.amazonaws.com/vavabi/ap_chemistry_ideal_gas_law_worksheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064e0.bin
b84907b33e2aa5d87ade80adea4503ceb8bfd54902fb3a49232402b9cba43fc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E0 4992 bytes
font_01_sfnt_off00007602.bin
bc319e71b2cbb3c8f58954be8b70be6f9862f5b8fcb51f754d9503e75227e970		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7602 9848 bytes
font_02_sfnt_off000097b4.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97B4 4324 bytes

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