Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63d3f107420ed1d…

MALICIOUS

PDF

50.5 KB Created: 2020-10-27 20:58:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3f969e9e952e84731ed723868f4adb70 SHA-1: 17ddec4564fbf6f68e2a4aef150345fbfa22b492 SHA-256: d63d3f107420ed1dfb4d0926e2922e29d14f8a431cffaa6c9b75cd31d65355b4
194 Risk Score

Malware Insights

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

The PDF contains a link disguised as a document download, which redirects to a known malicious URL. This is a common social engineering tactic to trick users into visiting malicious sites or downloading further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=essentials+of+pathophysiology+4th+edition+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5f910af241603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_5f8cbcf2e62a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zetare/assignment_abroad_times_today.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/31205619326.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/xijatuzigu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/5937/0904/files/behavior_chart_app_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0200/1570/files/duvudu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8121/3119/files/8298709762.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6923/3557/files/hunting_the_elements_part_1_worksheet_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/7171/9574/files/39980037692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff109380-7ec7-4f05-b1ca-523fc82f9415/5060449980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e665b8be-7fe4-4547-be05-61853055ad5f/67389639908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99772e65-4dc3-45a8-a3be-7da614b9c93b/83655477715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95eae779-9d39-4865-8dbe-f48878a743e5/65072026263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/236b97ae-5685-49ac-a7f3-4441348219fe/sudoruz.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/44164455939.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/23410123487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e0d1871-bf90-42c9-9bfc-bc72380dd14d/tidotezibova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb7f72a8-3242-4300-8c33-fb555c7f4b31/pozilefebugarawefapot.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000798a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x798A 5444 bytes
SHA-256: 449aefeaaebfef9dfcc7ff5b16a2876d13ca89440189fded03b24dae7635fd74
font_01_sfnt_off00008c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2C 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0000978f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x978F 10584 bytes
SHA-256: 031129faef851a68c835b7a175ddd3f2225e4f939d52b2993f8ee1e8c82edd47

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