Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca868c640c9536c…

MALICIOUS

PDF

37.6 KB Created: 2020-09-30 15:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b7b214275b834115364cb3c2585aa5cf SHA-1: 8f82a6306579b01d1a257285ca09f575a13a4e3a SHA-256: 9ca868c640c9536cfc82d2ac4630f70a094b1ac019ea43b303a07e15eaab460e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure. The presence of a malicious redirector suggests an attempt to lead the user to a compromised or malicious site, likely for further exploitation or credential harvesting.

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://gettraff.ru/strik?keyword=quadrilha+carlos+drummond+de+andrade+pdf In 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/2009cd2a-f350-49b4-87c3-a85030f1fd0d/tonajuvoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4089b285-d166-46c6-84dc-b900f0bcf465/mijibofevelonegoladorit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2e4748e-7a97-4ef2-818a-8db3746f5f24/15753458856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/438dd491-f8a4-4a53-b856-9ffbbb3c8182/62010329384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ee65ea-1f16-441d-aa5b-3a4be5168251/69778959336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0687750-239d-4334-b4a9-229046d2135d/votomulamavezizigowen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b4390a-cb84-4918-8819-3ca285c0d605/pugejed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8311/2341/files/molarity_worksheet_1_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/zenojuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/804f5faa-765a-475f-afcf-5373fb7289ec/jogafuwudum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e2a970e-6ea5-4aeb-aae3-12304948cc90/62188885280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95615501-373d-4f5e-8d19-cd24a6694125/rofinifabusefidajupuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a50c2d19-3055-4038-a29a-ba2e33a2b851/zanutozamev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7cc3e7a-fc76-4e24-89e1-64f4d186b0bc/dobekiwewojasebutetos.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_off0000539c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x539C 5456 bytes
SHA-256: 737b7f0cc8c14c7cbcad1772a6fc9196802c1c9e0c89150db9b50d26ccf6b009
font_01_sfnt_off000065fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65FA 10588 bytes
SHA-256: 31486c163e045961c26989927f685118e711018cdc52b1f35a37c34c0c019449

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