Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e25a24d29f58db…

MALICIOUS

PDF

55.7 KB Created: 2020-11-08 17:53:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 40a3f1ce6e05b75e801b158b4cf097b0 SHA-1: 1322ea91679b6a08d4e5548c13a92df302831a46 SHA-256: e2e25a24d29f58dbf931594c19486a5a11ab7a74b5cb9bd5095a67f180139383
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The heuristic firings indicate this PDF is part of a link farm, likely for SEO manipulation or to distribute malware. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's strong positive result suggest malicious intent, possibly to redirect users to phishing or malware download sites.

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://traffine.ru/123?keyword=choices+and+connections+2nd+edition+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5f9bac1cce13e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://saxofenofam.files.wordpress.com/2020/11/73320521206.pdfIn PDF document text
    • https://bafelego.files.wordpress.com/2020/11/lazubotuwira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68fd24cb-36d7-426c-972b-81b1890c4998/finding_missing_angles_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6ef8621-e97b-412b-ac10-4f64a8f040c9/ruworiwimusulosigu.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/19874119541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38bc74a0-c1f2-433d-be30-10e414df2f7d/duzezobosibajub.pdfIn PDF document text
    • https://duxagigeva.files.wordpress.com/2020/11/nujezud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae57eb83-d56d-4390-bc46-45eab8924cff/wetunaka.pdfIn PDF document text
    • https://tibepitetuj.files.wordpress.com/2020/11/36426037384.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/housekeeping_manual_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8d8bc88-46e1-44de-916b-9a4fed9b7ac9/93515911786.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/code_geass_lancelot_club.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/jelerupoxebamiwuwo.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_off00009b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B18 5152 bytes
SHA-256: 98b0581258c6626626006dfcbae305f077316f04cab377f8c313ec4b312d9c08
font_01_sfnt_off0000aca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACA3 10748 bytes
SHA-256: 3dd8e151b996a1acb7955a77dad257246e38182d96fa11899e53bcf01acca965

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