Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e50d826082ac22c…

MALICIOUS

PDF

43.5 KB Created: 2020-08-12 05:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0721259e6bdb15a59bda0f791730a2bd SHA-1: a7d1bfe94f448e844b7c6b8ff4473851a37fd697 SHA-256: 5e50d826082ac22c436dea79eb27f47269405abd4734da454576b05c9f371902
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to a link farm infrastructure. One of the primary links directs to a known malicious redirector, indicating an attempt to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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://ttraff.cc/pify?keyword=besluit+bodemkwaliteit+pdf
    • http://files.alessertraveledroad.com/uploads/1/3/1/4/131437246/523e05f35a.pdf
    • http://keripukof.pitchperfectok.com/uploads/1/3/1/0/131070420/wefamurajaniz-ruxofoniwade-jizipuzijirid.pdf
    • http://files.levusboutique.com/uploads/1/3/0/9/130969935/pivitenekarapevoba.pdf
    • http://vaxapav.alyssacouturier.com/uploads/1/3/0/7/130740514/mofalijutatuvow.pdf
    • http://files.bishopgumbleton.com/uploads/1/3/1/3/131379371/tokasinipegog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9105/8070/files/75001311402.pdf
    • https://cdn.shopify.com/s/files/1/0452/2960/5024/files/brothers_grimm_sleeping_beauty.pdf
    • https://cdn.shopify.com/s/files/1/0439/4863/8363/files/clases_sociales_en_chile_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0435/0155/1771/files/mozisosopunu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/asigurare_auto_anglia.pdf
    • https://cdn.shopify.com/s/files/1/0436/9140/9558/files/88486348689.pdf
    • https://cdn.shopify.com/s/files/1/0433/2073/7950/files/7407938826.pdf
    • https://cdn.shopify.com/s/files/1/0448/8983/3639/files/amls_manual.pdf
    • https://cdn.shopify.com/s/files/1/0447/9716/5728/files/ethiopian_grade_12_biology_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0428/3521/4503/files/morgan_clinical_anesthesia.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16175378270.pdf
    • https://cdn.shopify.com/s/files/1/0438/5744/5029/files/73438910952.pdf
    • https://cdn.shopify.com/s/files/1/0435/7373/9675/files/74847369685.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006af9.bin
e06cf55f41985fe62059bc8e2a5ad5fe7c4728c4ef0c5d1cfc7a66adb6fbfac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF9 5436 bytes
font_01_sfnt_off00007d78.bin
2ff5758bf7f0d291f8f9fb6a2417f084b4d644e0929796c711bba49abe95028e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D78 10424 bytes

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