Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eecd7b7a5be5b42…

MALICIOUS

PDF

32.8 KB Created: 2020-10-09 15:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b132401c5ca6dc7d8aaa8e8424a17221 SHA-1: dcd76069ea6898050007fef5509e79f02419df30 SHA-256: 8eecd7b7a5be5b420f43b2af3bfbae1d4205522f61573ed0bedf28445b01b1af
102 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The ML classifier also strongly flagged this PDF as malicious. The presence of a call-to-action phrase further supports the phishing pretext.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/strik?keyword=earth+science+study+guide+6th+grade In PDF document text
    • http://jejuk.claphands.net/uploads/1/3/1/8/131856077/c028d090a.pdfIn PDF document text
    • http://files.demelzafox.com/uploads/1/3/2/6/132696330/tupixemog-warusomesabago-bopagadusuban.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1269/9798/files/pagibifarubokawasabunor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1263/5299/files/dayton_horizontal_band_saw_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5920/7579/files/7158145554.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8795/4073/files/vabipujavap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6c9ac75-04e3-42cb-a3f9-78c12eac05f1/dedirimasedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c03d9dd8-4f08-48a7-99fc-a5527659a4c3/87374151679.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2703/8369/files/valeo_wiper_blades_catalogue.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2356/7512/files/michael_vey_the_prisoner_of_cell_25_movie.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2770/1665/files/mojave_desert_animal_rescue.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_off00004331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4331 5380 bytes
SHA-256: 953ce33f547fc5bb23b60c375d911100fff8d642e438851cb3c3a51a411be341
font_01_sfnt_off00005584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5584 9632 bytes
SHA-256: b20b62bc05bc11f736ef35145b344089aa7bf9b982b2cc47a3c0d6b2afa5e1df

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