Malicious PDF — malware analysis report

Static analysis result for SHA-256 4144c7d4c8f4015f…

MALICIOUS

PDF

57.1 KB Created: 2020-11-08 03:20:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ee38dc23a14a60f8638bfa30d4bd02dc SHA-1: 90fb0bd03ee878a94fd4498fb05c61370e820c70 SHA-256: 4144c7d4c8f4015f18b94f987ea9587c06778f5d5f87d0ad6981e2c4f52d6a5b
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/aws?keyword=minecraft+door+mode PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412164/normal_5fa0048ff2742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384817/normal_5f8ed6646dba0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408996/normal_5f9d350151e48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5fa3c24de0737.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/65548376527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96a27254-1c7a-44ab-b612-da345c7b7460/zokajonufivin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e2eb04-da90-4fd0-aa38-bd778517b6b1/eku_colonel_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9623051d-1454-422c-b5ba-c106abd443f2/18540054173.pdfIn PDF document text
    • https://vutejunisivo.files.wordpress.com/2020/11/46693313820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ed7fb1-92c4-46fe-a0d9-5ac667656b06/manual_of_office_procedure_income_tax_volume_iii.pdfIn PDF document text
    • https://metevavub.files.wordpress.com/2020/11/herculaneum_podcast_audio_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21741741-0e6f-463f-89ce-75cfbe3517a5/mebodevexeruvezo.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_off00008a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A7F 4964 bytes
SHA-256: 6a9b62278707c6e66940109afeacca117f3d9121bed97a28f3dff3c106cd167a
font_01_sfnt_off00009b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B59 10992 bytes
SHA-256: f09ab04a9fe22666c3b3e306f6417e158609ae2bd08399124f881a782fd6d798
font_02_sfnt_off0000c149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC149 16064 bytes
SHA-256: 8ce0575abc6f686af3c1393089841c21814f5c4838d5adbe0d649219e58da802

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