Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba55ac8e333cf270…

MALICIOUS

PDF

48.5 KB Created: 2020-10-15 12:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d05e86cd4b97cb9810a8f5aaea4c26a2 SHA-1: d58e0e050fe43220ec6747ee05281df588253937 SHA-256: ba55ac8e333cf27002dcd4e97b94b2c2c07ae0fd3905cca769f691c5de8e5064
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure. The primary URL, 'https://gettraff.ru/123?keyword=line+tracing+worksheets+for+kindergarten', is flagged as malicious. This indicates the document is designed to lure users into clicking links that lead to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://gettraff.ru/123?keyword=line+tracing+worksheets+for+kindergarten In PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/4246622.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/759977.pdfIn PDF document text
    • https://kakawugob.weebly.com/uploads/1/3/0/9/130969990/nimujobojuluguvodu.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/297c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5f87eb0f38a7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f8711623ffbd.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/2a5b38eef3430.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/litasifix.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/1774698.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/3274198.pdfIn PDF document text
    • https://nosekuge.weebly.com/uploads/1/3/2/7/132740467/94e49e4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1712/1177/files/59470497914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/910d0448-e079-457d-8aa2-f90cf44e9839/motijaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2a95a2c-487a-4e0e-9545-fb5855c34946/zarulewefonup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56c54e42-be4a-4873-b6a2-90ad2c55f0c6/85723599549.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cb69c26-c359-45d0-81ab-140e7636efe9/sulolas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2735/8115/files/15136762652.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1264/4251/files/club_penguin_ds_mission_7.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0499/1387/files/vinizipe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6944/6550/files/pigusawawavufi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000714c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x714C 5136 bytes
SHA-256: 95cd1fb570da8f65ab5c88d70e549a73a5135a2a3a421ec5fbbfc139137c6e4a
font_01_sfnt_off000082c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82C7 10280 bytes
SHA-256: 062782871dd6d401ca2a070bd25219c8b51a1faadc3536b2cf2747d3b03989f9
font_02_sfnt_off0000a5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5FC 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361