Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e620501e29e004…

MALICIOUS

PDF

91.5 KB Created: 2020-10-28 11:02:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 036d19382e0f01164ad3849aa1bede45 SHA-1: d706cf1065059e987583d75ece460f9bbe108fb7 SHA-256: 51e620501e29e0046841a0534c4c33efb27d338b0908b8143d78587dbfa3730e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external websites designed to host additional malicious content or redirect users to malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to known malicious redirector infrastructure, and PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a coordinated effort to distribute malicious content. The ML classifier also strongly indicates maliciousness.

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://cctraff.ru/strik?keyword=suikoden+2+spoiler+free+recruitment+guide In PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/2cc4de7ee6.pdfIn PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/55da6ffd7.pdfIn PDF document text
    • https://vukijimox.weebly.com/uploads/1/3/4/3/134358494/jinefagufejode_pododasesineduw_tumuzosusosuxus.pdfIn PDF document text
    • https://fepirajoruvizu.weebly.com/uploads/1/3/4/3/134311883/kujodorome.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c037d1f7-ec31-45c4-b03d-817a7efd5955/suvogokolobojivujaturanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fef06e4-0667-4254-8f49-49ba74ee421c/gujafanomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14786142-0c4e-452b-8fd5-34177ea43c13/breakthrough_advertising_by_eugene_schwartz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a54aaa0d-6442-4a9f-b588-b7547c68bf40/92507972200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb502ba7-38b3-482a-8dc9-ad4aea784ba4/28844548145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98935d07-a3e9-4c65-b9c0-c262ebfa078f/sevtech_ages_guide_age_0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f2de983-5a49-4817-8413-8e49ad72809e/17228375868.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8530/9103/files/6836743987.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5940/7765/files/wheelbarrow_tyre_size_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1560/2339/files/high_voltage_direct_current_transmission_arrillaga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/7620/3707/files/treatment_of_euvolemic_hyponatremia_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/932fdcc8-8376-4988-bad6-36c62c779678/tolib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b074153-49ed-468b-b7d0-82d5acec6455/11173924904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/213b3c52-47ab-4557-a63a-ec0ed4bfa762/42241425837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04043742-859d-475d-abdc-27e3b2a74f29/catering_business_proposal_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd1e6ddb-1c0a-406d-bbab-63de526c6e97/2009_ford_focus_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2432e3a1-0220-4a41-be3f-0a8d316d240a/usmle_step_1_questions_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b425a9f-3df6-46fd-997b-4bb0bfe87cda/72772373521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e0f9beb-8639-45c4-add6-9a673f4fc4e6/ziralisabali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd81cdc2-23b3-4ba4-bfcf-6a8254ae9617/65562071657.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_off00012647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12647 5564 bytes
SHA-256: 0b856dd6f7b6ad0c20188ac50c7d0ecabf96492639298a849fa1baaa7df38c8f
font_01_sfnt_off00013918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13918 11752 bytes
SHA-256: ce86f588f9ddc5d8d83b976c1cc3d77e20da9d7e777417e547cdf3f9ccfd9fca