Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5ec4c3cd8e3417…

MALICIOUS

PDF

38.9 KB Created: 2020-10-26 22:46:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: a7a445a7c8a3726e9fafb259c3b535b5 SHA-1: f7e0fc66d05bc392636d1fff771c87f59d3fb262 SHA-256: cd5ec4c3cd8e341787e13cab488bcf40f1d2f90aac960921adc5fe530bab66e6
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector URL, which is a strong indicator of malicious intent. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded link suggest an attempt to lure the user to a malicious site, likely for phishing or to download a secondary payload.

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://cctraff.ru/123?keyword=case+files+pdf+family+medicine In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_5f8ba8d685643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f872c59e6695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407100/normal_5f93ae0bf338c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_5f8f68987167d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_5f8a13166494e.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/1/0483/2192/1177/files/berserk_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9778/7035/files/xefelakozikejedowuketi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6348/7897/files/kepakujuviluzedak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/6664/4384/files/clinometer_bubble-level_full_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/4936/8743/files/soho_gothic_font_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2199/2599/files/26327856680.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5862/5192/files/jaram.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/41837712795.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/32756579738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04356f4a-a94e-4ce3-a917-a203da625a0d/do_dargyns_spawn_at_night.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28240b68-b649-4c63-a3d4-5e9035354d15/47753663205.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ede2d82-6488-4228-b46b-532ff9ef5140/rimiboxubedavetasawuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/197fc834-93c5-4298-acb4-2e5b9e753642/ditanakujewuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97ca1de2-012c-4087-b00d-6bd82e0c1cd8/human_anatomy_and_physiology_textbook_online.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_off0000592f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x592F 5212 bytes
SHA-256: e8f7129ffc5b5a5f0dd68c4a03e77310a1ebf6fbc039668d98c1c2ca6e6dea6c
font_01_sfnt_off00006ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE2 10504 bytes
SHA-256: 70be735cf64ea7a7c9baebed1094a53d92fc91db030dcc0a669f89b3a0ed173b

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