Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4df5ea4b65d855…

MALICIOUS

PDF

47.2 KB Created: 2020-11-02 21:11:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d8742dbc5293fb128cafb4896441ec54 SHA-1: bcd6f7097342d2c25fcfb4b2c15a3d90f2eeb280 SHA-256: 9e4df5ea4b65d8554bbc86a2f8184e6e6fe6284176e1ed63caebd5d7297d85a3
94 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL, https://gettraff.ru/strik?keyword=descriptive+words+that+start+with+letter+b, is the primary indicator of malicious intent. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to lure the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=descriptive+words+that+start+with+letter+b In PDF document text
    • https://xelabuxu.weebly.com/uploads/1/3/4/2/134235382/4295d3dc249a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374373/normal_5f9c84a32c1a8.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/0a6df7e6e2408.pdfIn PDF document text
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/mizunima.pdfIn PDF document text
    • https://vuxomikum.weebly.com/uploads/1/3/4/5/134587944/pumetapobumikaz-najoberefed-tizigexora-vobumolaremu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e6c36ef4-ef9e-45b2-a3a6-296692c358e7/benusotexur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a3ec728-d788-4a8a-9ab5-bd42178e659e/pelozogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37de2cee-d26b-4ff3-8a90-738cf1373ba9/tamao_de_la_muestra_formula_poblacion_finita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9e4e70-5566-410b-9f89-94c5561e4e85/nogafuvo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0420/5503/files/surface_area_polygonal_prism_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/4865/4752/files/mpsc_mains_syllabus_2020_in_marathi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/4947/4971/files/ezgo_marathon_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9377233e-73ba-455a-94c1-2edeefdb6185/32427769087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d39f0c3f-1ec4-4dc8-9a90-88ebedac1c6c/zawelax.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2E 5136 bytes
SHA-256: 2ca29aeb0ff408186fe3eb98270aa4eef5c14b164b8ff188959f8c7c76201cdf
font_01_sfnt_off00007fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC3 10024 bytes
SHA-256: 526a149c6dd07ff6716dcc6a1d7eb669dfc7116180389d5f1cfd048ae076bdd2
font_02_sfnt_off0000a18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA18E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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