Malicious PDF — malware analysis report

Static analysis result for SHA-256 779cb7e934d6b2a5…

MALICIOUS

PDF

54.1 KB Created: 2020-10-22 20:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: de5648313466b247b99a3173bea04d16 SHA-1: d4935f62ee52501e10caa54123a5257d0a904e6a SHA-256: 779cb7e934d6b2a5d5a6d7277aad6518350c61d3562973715b49eefda91fff37
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/123?keyword=apush+amsco+chapter+15+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387924/normal_5f8d7e66e1408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387821/normal_5f8dd0f074e0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384048/normal_5f8ccd3f1a681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5f89d65aa4059.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/4d5351fbb209c0.pdfIn PDF document text
    • https://fopimakalegej.weebly.com/uploads/1/3/0/7/130738542/3811e06b12.pdfIn PDF document text
    • https://fuvipizewovotat.weebly.com/uploads/1/3/1/0/131069886/0f65b14dc759.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/potijizegelenunazig.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/21d5c181-1a85-49bf-9b46-5f00b7ce068a/integrated_chinese_level_1_part_1_workbook_answer_key_lesson_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daf8b15d-4794-43bd-b206-f8c0de62ccf8/xawuwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb7d2b37-03a7-46f4-91e0-e65d7efab67e/65193158244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b02415-2916-4115-a30c-a6afb0d90f02/mugopudofivedozav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a64d25d-1e93-4b16-a43d-31f0b067c4bf/melemitamab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec0876b2-f0fd-462e-95b2-fce4aa31ae70/vixepuzulobagututosobis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6382d760-dd03-4758-8234-3fecda4ebf46/62924072658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dccbe336-7d24-45cf-b90b-9376b09b82ca/zokawufisajupowiriluvese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c0b6681-e3b6-4f1f-a281-dcf269bfb427/wosogisakorugewufezuniz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cd0d529-080b-4cd4-a37b-1fcc5c6a1254/vipewujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fd8dabc-e270-4fcf-bb29-c76a8b620000/bupetemonunid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd2ae49d-1096-46b3-aa17-0f1599526d36/ritemuzawilijaruxibujow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/458bf66b-820f-4f1a-ad11-1db7bd219768/18179813441.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/52460051890.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/barcelo_bavaro_palace_map.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/ielts_writing_task_2_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/bihar_tet_notification_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/37737793215.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_off00008414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8414 5256 bytes
SHA-256: 30079c50d7e4ddaf24bb5e06a6e2885d677e1ddd67f9868c1b0468d1c5bb2625
font_01_sfnt_off000095f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95F5 11276 bytes
SHA-256: 3fbaacbc56436be6ea4e7cdd2886fcd7ebe76a8d4467b2339bfd4f0b9db9b69a
font_02_sfnt_off0000bad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD4 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176