Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c1db03345407f4…

MALICIOUS

PDF

34.8 KB Created: 2020-11-05 09:37:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8963f214d7232c341338e2457d782342 SHA-1: 26ada4202c9e5dd5fdd1b1d5ce52f64712ed26ee SHA-256: 90c1db03345407f4d49398abaff065566a9ede234deba4ae00f85ece0582b80b
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a product, likely to entice clicks. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/wb?keyword=mini%20uzi%20electric%20airsoft%20gun In PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/7911743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_5f91f419231f4.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/88068fdb6b75.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/perifikesaxafa.pdfIn PDF document text
    • https://xuwojuzo.weebly.com/uploads/1/3/4/4/134471705/16058.pdfIn PDF document text
    • https://jujodupif.weebly.com/uploads/1/3/2/3/132303189/8377624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380411/normal_5f8c723b68f80.pdfIn PDF document text
    • https://xumabilere.weebly.com/uploads/1/3/1/1/131163638/1c638f.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/xorufisefifamegitobi.pdfIn PDF document text
    • https://kafedujewerom.weebly.com/uploads/1/3/4/6/134622586/5e7735e7.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/juvetaso/fm_hifi_wireless_headphone_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/bach_bwv_974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fe5f60a-38f6-4e6e-9686-a9aef064266a/nitagusetadakabas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e14d712-b0f0-4a11-b78d-b3e4d79b9a7b/zamemefalizulogupozajuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36dff625-5338-4783-bb69-18b8923c7c1c/27649106907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/380b8061-640c-4d7f-a40a-747b5b388c28/zoxadumoragomi.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_off000049b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49B0 5104 bytes
SHA-256: e808f65e6237fcd54aa5994d4090787cdf48ec0cada5865cb5bf2ee36124169d
font_01_sfnt_off00005b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B33 10340 bytes
SHA-256: 978ec275380de8372a773aae40f04381fc0731bab6ba55514fbfc7974541245f

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