Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c3978eb4719b00…

MALICIOUS

PDF

47.3 KB Created: 2020-10-28 08:02:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a6162d9d07abc4d72bd4537b76d8ff84 SHA-1: 1a5db8d0333fdec64314f2830d1341544922c3e2 SHA-256: b4c3978eb4719b00fd7a6487ebfc5ee20f6b1acd7156ab9d0797826c191cda5a
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=wyoming+department+of+corrections+administration+office+near+me In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_5f88c20323667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5f8ab0ce27eb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_5f927cd4a900f.pdfIn PDF document text
    • https://posodukur.weebly.com/uploads/1/3/4/3/134347560/zudidi.pdfIn PDF document text
    • https://jibudodenip.weebly.com/uploads/1/3/4/3/134364722/7ed0d6e4d14e54.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://s3.amazonaws.com/zuxadol/76319985377.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/california_consumer_privacy_act_full_text.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/wegebesa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/2319/9140/files/sopusegodowak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e099ef7-1c1c-4b31-95bc-790425384aa4/22117644891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f8cc51a-40df-4311-b0d8-e8d0500b9198/bo_cv_rnei_indir_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe5c8a3a-0621-4fdb-a688-bc5ce425982e/motatopikopagifimepewari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f2152cf-fb0c-477f-a199-4143b53b251d/revofekodorojanusupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cb28eef-be00-47c1-9aa9-719300ff1559/lusemijolurawefatof.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/english_alphabet_worksheet_for_nursery.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/72039832656.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/ralunu.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/reality_is_broken_espaol.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_off000068d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68D2 5348 bytes
SHA-256: 6211de9ed6da6e893f65c9030cabda3b025a104caf4c8f4600f7c4c49df4cedc
font_01_sfnt_off00007af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF5 11732 bytes
SHA-256: 8e5ebeadc364f5e207b01e3c9a60e73e9d72d96fa376dccc2e48e7bbde199c86
font_02_sfnt_off0000a17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA17E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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