Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93cbbbe96895686…

MALICIOUS

PDF

56.9 KB Created: 2020-10-31 09:08:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 30d31df59f9615dfb6b0eb337486798b SHA-1: 1679d5afc4cd2bb53710e0d0e8c60f3e83e9525a SHA-256: d93cbbbe968956860a98bfd0996210a57e1fdaf24b2ae1745d4ce3d17de27408
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF document contains a large number of embedded links, forming a link farm designed to redirect users to various external resources. One critical heuristic indicates that these links lead to known malicious redirector infrastructure, specifically pointing to 'ggtraff.ru'. The document also attempts to lure users into installing remote support tools, a high-risk activity in unsolicited documents. The presence of numerous links and the malicious redirector suggest an attempt to distribute further malicious content or facilitate unauthorized access.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://ggtraff.ru/aws?keyword=ff14+samurai+macro+guide In PDF document text
    • https://lokedidige.weebly.com/uploads/1/3/4/3/134315074/664611f3b95.pdfIn PDF document text
    • https://vodoxakitukep.weebly.com/uploads/1/3/4/3/134335140/68da6b.pdfIn PDF document text
    • https://wetejitaxazis.weebly.com/uploads/1/3/4/3/134306742/49070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_5f8e9ad6ab78e.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/93049f265a0000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374700/normal_5f8aa6bc6746f.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://s3.amazonaws.com/xilasisefi/13989229614.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/the_economist_28_september_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1287/3128/files/install_teamviewer_on_android_tv_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a639bd53-8ce4-429c-81b6-e01f0c13a628/21399725583.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/bijakonofunelugew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a901c34-c1a8-4c42-a3a8-e9413aa79423/dumemirifepoj.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE7 5100 bytes
SHA-256: 83aa3f39e9e88155fbf8b20966b8f5b2d8afa69059131bd0d902486aad396936
font_01_sfnt_off00008e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E41 10992 bytes
SHA-256: 9c2866b3fc596f4c7e50af10821f9c898fc8fb1bacd7b036a215f5e666972460
font_02_sfnt_off0000b3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D6 16076 bytes
SHA-256: 97990adcc91a1e334b404002f9a6b356dd0e0e66c9193a0499481f503a30e292
font_03_sfnt_off0000c881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC881 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333