Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9127c44e167cc7…

MALICIOUS

PDF

41.9 KB Created: 2020-10-15 01:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 73632441146a56c27e1882dc3addf551 SHA-1: 5df89780137a613c17ef058dd1e07e797173cfc2 SHA-256: 9e9127c44e167cc768297850389418e016ad0980bdc619739bdb500fbe53bdba
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm designed to lead users to potentially harmful content. The primary goal appears to be directing users to the malicious URL for further exploitation.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.club/pify?keyword=surface+area+of+prisms+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f87350de1cc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f86ffe134d03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5f8767e543fee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_5f8729b2e0097.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5f877303462f6.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/4041939.pdfIn PDF document text
    • https://site-1041579.mozfiles.com/files/1041579/16546714947.pdfIn PDF document text
    • https://site-1038627.mozfiles.com/files/1038627/11300717779.pdfIn PDF document text
    • https://site-1043878.mozfiles.com/files/1043878/30948614422.pdfIn PDF document text
    • https://site-1041090.mozfiles.com/files/1041090/wawuminaropuwot.pdfIn PDF document text
    • https://site-1038776.mozfiles.com/files/1038776/kizawonifubulavolazad.pdfIn PDF document text
    • https://site-1038517.mozfiles.com/files/1038517/safegeletebujunekoba.pdfIn PDF document text
    • https://site-1040080.mozfiles.com/files/1040080/dorejivokajuxisazisa.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/11e93b87-6cc2-48a3-8cdc-d2879f2f2d84/fumurob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/634fb2e2-de33-44ec-acc0-3958d518bc3b/baxidabumakobixufamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3e896e4-45a6-4381-9e96-08371af69434/8212259008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3811860e-1607-4e62-8e6c-d3eb71a81efb/zoxumavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6622914a-c47d-485f-8bdd-04c53c77019d/dadejapukaligeniwufav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a1f6354-d1b0-4e5a-b72b-4f52dbd3c8ee/42584110033.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3d695b8-2b48-448e-b9c6-0fec8e1dbc56/kitanabujisikuvuf.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_off00006426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6426 5372 bytes
SHA-256: bbd927e341b25feb6b4e5a545068d5939387d43b20e3e26f43b2f7609a6e9d39
font_01_sfnt_off0000764c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x764C 10564 bytes
SHA-256: d72785ea8e99f60dd9bbbf1fd87e9805d849eb282bab22c62e064709d93a83c8

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