Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad57e51bf0f3073…

MALICIOUS

PDF

35.6 KB Created: 2020-11-01 12:44:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4498fd61f82b293789619e826d813d82 SHA-1: 3153934a627c3b9fbaecf0e453fce33cc5189222 SHA-256: fad57e51bf0f307316d8b869b6c4e7b9898d706e0d084bb2b42fdd5b3026fbc5
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and URLs, suggesting an attempt to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the presence of multiple external links points to a link farm or redirection strategy.

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://gettraff.ru/strik?keyword=hellish+rebuke+5e+dnd In PDF document text
    • https://cdn-cms.f-static.net/uploads/4420915/normal_5f9e80ccf2186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380080/normal_5f9145df28963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412160/normal_5f9de9069adc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409098/normal_5f9b770aeee60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374362/normal_5f95295d810a1.pdfIn PDF document text
    • https://radutarogo.weebly.com/uploads/1/3/4/3/134379411/xedonixamokin-runufujo-gulixapalakuk-ruvegiwamobafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5f891d0561967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417024/normal_5f9c59ef65b68.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/59a22fa1-88b1-4ada-b16d-c97ebada38a0/zevitalepidabuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d9488d1-0c8b-4c51-9663-2b9051f94148/sizebovorofolamamopel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6695/6707/files/pixel_launcher_apk_download_for_marshmallow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/0218/0006/files/chevy_cruze_2020_engine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c6d6d93-f884-41d8-a043-3c052e5ccb7c/mitaga.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4ED9 4992 bytes
SHA-256: f7a50c403b0905c08414b982b1526c12c1824eaceff1a249564e45945b55f30c
font_01_sfnt_off00005fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC7 10104 bytes
SHA-256: 85266f20d9524733d4a5bc7798b73025285dfa8363c0e9f87ecf654d6a18e78f

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