Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c039ae3ce1eece3…

MALICIOUS

PDF

53.0 KB Created: 2020-10-25 19:35:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e1ea91732b9cf9d6549eec731539cb7e SHA-1: de03a16872ce9d2c236f8eff092e10cfeae4c052 SHA-256: 4c039ae3ce1eece3772f7d721f1a545863b8bec85aa861a4237a486a201d2733
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 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://ttraff.link/123?keyword=violator+kush+grow+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_5f8b72b2e9daf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374188/normal_5f8ef1f5179e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f8b834c2c82a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409623/normal_5f9355a558161.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/1256912.pdfIn PDF document text
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/2386540.pdfIn PDF document text
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/kuniwusuxufifikidu.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/f12182a1-aff0-4a76-b3b1-756e553e4e8e/1087669629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ed00f08-5872-4f3f-877c-ac3b487b7547/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eddf3a94-20a1-4f3f-8b1f-a95a7f4d92f1/creating_america_textbook_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/149e21f1-781b-4210-b15c-95f9ea849cc9/zokiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e25bca43-1fa8-4496-a987-e40a34be20ea/6528069077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6143538-54b0-45f2-aacf-4ce01b460450/gutezowuxedidurigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c686765-98cb-4946-8100-cedd9b46f24d/96259001999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2512501-fc34-4210-9760-05db74561a32/43979649962.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c89ffd8-b2a8-467d-ac89-cce2774744a5/30839929608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04a3b5b6-50da-455e-93dc-a89647803b3c/26184488471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7e73322-85fe-4d61-950d-57ab418ad2a7/zajoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e21bfbbd-b298-4707-aa7d-794c8d97895c/gobidavozaruxuti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9916/8163/files/combine_several_worksheets_into_one_workbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0456/4418/5767/files/teaching_listening_strategies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0887/1581/files/lukerutikuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0835/9067/files/killing_floor_2_class_guides.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7354/2579/files/water_and_solubility_review_worksheet_answers.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74B6 5208 bytes
SHA-256: c57fa47fd2c47d96e0a56fcc685d8498aa95dbf85bce4788ed375c2720ce33d8
font_01_sfnt_off00008672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8672 10612 bytes
SHA-256: 457793effc0ed583b1e1142c3723c27fced4960f541f2c65543900e153fc43fa
font_02_sfnt_off0000aaa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAA3 18220 bytes
SHA-256: 3d1eb0ef703454c63b8100cf582fd78b050b9b0827ad5ae021bfb894f8af8077