Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41bbc12ea244acf…

MALICIOUS

PDF

66.1 KB Created: 2020-10-02 10:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 6948d3eeccdd0b219eafc8abb7bcad06 SHA-1: df833aa3eb53b6aefb0169b10847bbb659aab201 SHA-256: d41bbc12ea244acf58834676b0d8fef5ec977e2e3d58d00e4a6022cba4a28248
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://cctraff.ru/strik?keyword=arabic+alphabet+in+english+pdf', which is flagged as a known malicious redirector. This suggests the primary purpose is to lure users to malicious sites, likely as part of a phishing or malware distribution campaign.

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://cctraff.ru/strik?keyword=arabic+alphabet+in+english+pdf In PDF document text
    • https://site-1036839.mozfiles.com/files/1036839/nokupevutijoxoxijut.pdfIn PDF document text
    • https://site-1038830.mozfiles.com/files/1038830/16172487421.pdfIn PDF document text
    • https://site-1036869.mozfiles.com/files/1036869/gosojodinotobepirosi.pdfIn PDF document text
    • https://site-1036996.mozfiles.com/files/1036996/95548774299.pdfIn PDF document text
    • http://tidade.stewartvillesportsmansclub.com/uploads/1/3/0/7/130740118/7745036.pdfIn PDF document text
    • http://lurup.mnhaequinemassage.com/uploads/1/3/1/3/131383377/7293497.pdfIn PDF document text
    • http://files.nydrivinglessons.com/uploads/1/3/0/9/130969633/01a8203611dd.pdfIn PDF document text
    • http://sedika.dancefixx.com/uploads/1/3/0/8/130873782/dudobotefukukutirin.pdfIn PDF document text
    • http://files.benoitfarmsandlivestock.com/uploads/1/3/1/3/131398182/4119318.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/e8338651-fe9f-460e-bcca-71135dc5cefa/44474069152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7343e23c-c77d-4fac-aed1-b5c47eeb5702/xopizetini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc00157b-3b99-4395-ad31-65305f76366e/karedutigiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb2d05cd-be92-4e76-8d8c-5bc07253a7f6/japijosotewefufiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40c3f5b3-7a75-4933-891e-ba3d284b53cb/54699749352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a76d49c-d8a6-4f69-b8ac-9eb1e5053ae8/10582640466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac1a07d9-db9f-46ed-9b3d-b2b9acebef5a/13699401164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d56dd29-205f-49bf-b545-2837f4d0a334/78386428978.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000c385.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC385 33468 bytes
SHA-256: cc353e9b36ff5f7fb14b41ac753f3edb3959e893e5342bc387aad9a00aa8c3f3
font_00_sfnt_off00008b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B86 5544 bytes
SHA-256: 320373e3fed4ff0ff8b9533143f26045d86df494343841b443048db4f01d2a4e
font_01_sfnt_off00009e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E54 11336 bytes
SHA-256: 178f64cbd9c40a058e22fc4bc830df3b9bc102a0f75a070a892a1bd936be0d85