Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aafb1c4e5edd737…

MALICIOUS

PDF

61.6 KB Created: 2020-10-01 12:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0dc7565b068b942986c7742b791b1aba SHA-1: d0636e86b62c6adaa2b6b3462fca2c1bdb0c2e45 SHA-256: 1aafb1c4e5edd737eee9f4e949ab35a16aac0aa37afe9969d6167476bc5eb8c2
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically `ggtraff.ru`, which is flagged as a malicious redirector. The document also functions as a link farm, pointing to numerous other PDFs hosted on disposable domains, suggesting an SEO poisoning or phishing campaign. The ML classifier strongly indicated maliciousness.

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://ggtraff.ru/strik?keyword=hiv+and+aids+symptoms+pdf In PDF document text
    • http://zusin.484sign.com/uploads/1/3/0/8/130874493/wojonugapemitezuma.pdfIn PDF document text
    • http://zomawa.johnnytalbot.com/uploads/1/3/1/3/131380600/verapozebex.pdfIn PDF document text
    • http://reguvi.sufiireland.com/uploads/1/3/1/4/131454415/vadigusi_favapemudorejo_zirumured_tisakel.pdfIn PDF document text
    • http://files.roseannstudio.com/uploads/1/3/2/6/132681150/zuwar.pdfIn PDF document text
    • http://fexidek.wagonwheelacres.com/uploads/1/3/0/8/130874317/lefanowuwarojatiwela.pdfIn PDF document text
    • https://site-1036646.mozfiles.com/files/1036646/rufetezujir.pdfIn PDF document text
    • https://site-1036800.mozfiles.com/files/1036800/26341024837.pdfIn PDF document text
    • https://site-1038590.mozfiles.com/files/1038590/mopexulomupijezozixip.pdfIn PDF document text
    • https://site-1038622.mozfiles.com/files/1038622/lijigusisuboxanukid.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://uploads.strikinglycdn.com/files/3b6956ac-c51b-4f19-b6d4-b657f69e260d/61221133785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aeeaa92-8c85-4dee-a3de-8ea498fdcc91/motagonogezatixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a61c7e4-aa94-4011-a2af-b5729205c474/jesejexa.pdfIn PDF document text
    • https://medlineplus.gov/hivaids.htmlIn 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_off0000a92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA92E 4852 bytes
SHA-256: 1e1c7b52994a5220d338ffc284d31e17228ab96c1332ee06971c34627e0346ae
font_01_sfnt_off0000b99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99A 9880 bytes
SHA-256: eb576e9a4f19060a5a7845434d2d9dbce642da9a42b4bbd36754db310c358663
font_02_sfnt_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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