Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b912a389cce2e15…

MALICIOUS

PDF

47.3 KB Created: 2020-10-27 16:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5c97915ce7847fd00b3e164be6319165 SHA-1: 1bb408cffb0aa94682ceb9d1f938c1a58ed2ad8e SHA-256: 4b912a389cce2e15a6b668042e9f13cd1c95374bfd05782310c84aaf185f995d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO poisoning. One critical heuristic identified a link to known malicious redirector infrastructure, specifically `https://cctraff.ru/strik?keyword=usb+complete+the+developer%2527s+guide+fifth+edition+pdf`. This indicates the document is designed to redirect users to malicious content, likely for phishing 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://cctraff.ru/strik?keyword=usb+complete+the+developer%2527s+guide+fifth+edition+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_5f87b05445ab3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f875d2bc4d34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f950c0406f4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_5f8bd8dcc7f82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369764/normal_5f895afa16cae.pdfIn PDF document text
    • https://sikinuvozo.weebly.com/uploads/1/3/4/4/134451197/120d8b1e5775.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/dotepag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_5f87e0d208d05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417999/normal_5f975419c1f16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402710/normal_5f9320e2b197e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367680/normal_5f89a9064f248.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369496/normal_5f9235698ea95.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/54baa340-9693-4052-b6a7-df688665917f/21338046780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40215036-cbbd-4ba9-bed8-6d23e0da43c7/39247088484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47100a66-2293-4cf1-82f5-5120be0511c8/65148445028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94cd8073-a31b-4ad7-b61e-56f197938edd/49993042986.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/calendar_november_2019_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/besoins_fondamentaux_maslow.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/17354208231.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/oxford_picture_dictionary_english_persian.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/23930024450.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000692f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x692F 5468 bytes
SHA-256: 50f273ee5e0d1fd22f2104f0f0f88d160a1615175f32fdaa90bfec28c000fccb
font_01_sfnt_off00007ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA8 11108 bytes
SHA-256: 8ddde12908b034433f958b53b46f538ad4c6a4e889b3c6002b9be87e8a85eeb9
font_02_sfnt_off0000a147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA147 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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