Malicious PDF — malware analysis report

Static analysis result for SHA-256 621ba68904ccda8b…

MALICIOUS

PDF

71.8 KB Created: 2020-11-03 02:46:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 478fc7a8204f7982cff400a41326780c SHA-1: a250f4dcce35175ff58c421c639d7a9109ba33a4 SHA-256: 621ba68904ccda8b9fe584bd7339b9311aee343bf33c2fd83d9816e5abf875d9
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links to other PDF files, identified as a link farm. One of the primary links directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and embedded links suggest an attempt to manipulate search engine results or distribute malicious content.

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/wb?keyword=mark%20taylor%20prophecies%20trump%20pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_5f8ca866a84b7.pdfIn PDF document text
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/aed55d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376357/normal_5f8e1edf30d0c.pdfIn PDF document text
    • https://revibafejinaj.weebly.com/uploads/1/3/4/4/134485322/1618605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446500/normal_5f9f31171819f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_5f88a194672cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/tisupoze.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/78366325555.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/25357620323.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/calendario_2018_por_mes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56cd56d3-f667-47a8-b790-fe6a134dcd6a/59165849839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b93a2c1-3bf7-4921-9e46-ed397d526f94/jotabanaxa.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_off0000dbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCF 5568 bytes
SHA-256: b47c1c8d2652c7d9ee956611ed38625bae76aaf24678736f8a0d960cae0d1e1c
font_01_sfnt_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 10484 bytes
SHA-256: f62d53ff6647975c2211d5bd397c42c4ff016138e60d9b14c452dce74e3f78fd

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