Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87cb51fa7ac54de…

MALICIOUS

PDF

41.4 KB Created: 2020-10-16 15:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 7292b0bff9d34fd1175dfffd2641d560 SHA-1: 9aab3b13177b4e680e5a843c1fc21b88d2602657 SHA-256: f87cb51fa7ac54de142e8da2a985a2912e87d764f39ed5829f4884cd1b4efa39
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to link farms and redirectors, indicating a phishing or scam attempt. The primary link, 'https://ggtraff.ru/123?keyword=free+recording+studio+app+for+android', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

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://ggtraff.ru/123?keyword=free+recording+studio+app+for+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5f87055747200.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_5f88c4829a786.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f873d692bdcf.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/foburadip.pdfIn PDF document text
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/tomobezuzisixom.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/6176058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f888768699c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f89610d85a3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f87469f8f26f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_5f8842f41d81b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/da9a22e4-4ea5-4690-93ef-6807eb79be8c/96318797536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b515875e-0277-4e8e-980c-f983209d0ce2/68061376704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a45df2c9-ce00-47b3-846e-c360fbe4a50c/7729516325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a6d603a-47a1-469b-ab12-cf95f466af8f/37527603811.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a76f930-ef58-4d75-809f-81c0be781463/14420056373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0e5d4cc-5fbb-4743-87ba-b8fa44433990/89032707369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98327209-448e-49e2-9e4f-150b1e38fb27/19243654669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8655a7c-84e6-4130-9af3-4b20dce68b8a/tafoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f09b55a-696e-4671-93cb-7b47d6a16939/refifexebagasuzojova.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_off000064d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D2 5248 bytes
SHA-256: 4fc45525e97b8d04b778158bacfcd6c4243d499da00a90d5a8b41897e75af7c7
font_01_sfnt_off000076c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76C0 9904 bytes
SHA-256: 9ffb32e1776061fc09d56a034ef5d515af66712df9fbca51fdae45d958a8189a

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