Malicious PDF — malware analysis report

Static analysis result for SHA-256 3622d7be8b0b9ed4…

MALICIOUS

PDF

55.7 KB Created: 2020-10-04 08:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7f061fd537fc5ff5a22f3c1573839b9c SHA-1: 28170ee11c160b143ac2002492fd5407cf46e54e SHA-256: 3622d7be8b0b9ed4222806faf7a18aa70387419699de28c88a548eec1b6def42
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector. The document body, though partially garbled, contains keywords related to exam syllabi and includes URLs that are part of a link farm, suggesting a phishing or SEO poisoning attack. The ML classifier strongly indicated maliciousness, and the presence of redirector links confirms the intent to lead users to harmful sites.

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://cctraff.ru/strik?keyword=tnpsc+group+2+syllabus+and+books+pdf In PDF document text
    • http://nariva.truthserumhottopics.com/uploads/1/3/0/7/130738970/xifesabil_dasugenekebuw_jenov_rinenaga.pdfIn PDF document text
    • http://dufiwaguw.vterryscience.com/uploads/1/3/1/6/131606490/lagujabu-zuviwaponu-fanadino.pdfIn PDF document text
    • http://newatep.hafadventures.com/uploads/1/3/1/6/131636719/fenav-gokixajeve-zawubeko-dufelofedem.pdfIn PDF document text
    • http://wodev.indexid.com/uploads/1/3/1/3/131382786/lanatawirezitip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/afb44cc7-9266-4811-a868-e1d073e2f703/pinifoluwiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b69d1a27-2424-4adb-9514-c37cd6e97414/genezejarivubinigikove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2de684fc-0482-4a3d-81bc-6f5f6dc78d48/66884245325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e64eda5-9957-4171-a128-a35bdbb18d8a/34824882167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be284216-f17e-4221-b5a7-405b2862dd96/23947951456.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4862/3510/files/5286863858.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6655/5556/files/microsoft_wireless_mouse_5000_driver.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80A3 5344 bytes
SHA-256: df71935bd6f5e3297aa4848662da57cd2af5a18f366e8f69229a38dc524509f5
font_01_sfnt_off000092ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92CA 4312 bytes
SHA-256: 4672445b782e3a86ed382abc4ebc81615680e0f024926e7b9911694e707b2d7f
font_02_sfnt_off0000a0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0BC 10084 bytes
SHA-256: 74d35a54e2cafe9d77fe7fef8170931cb7293acc940e60bb43c81015d2f4cc90
font_03_sfnt_off0000c350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC350 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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