Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cafedcdf2924051…

MALICIOUS

PDF

44.5 KB Created: 2020-10-06 16:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b2153bf66dcedbda311680074acf87ca SHA-1: f9ebc557e0c32bdac4214f2a3dbf066bccbb6dd8 SHA-256: 4cafedcdf2924051d5b1d0f3b672619a1bb09b3d8244734c4d53b45223957008
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 suspicious domains, suggesting a link farm designed to distribute malicious content. The primary lure appears to be offering free engineering mechanics books, which is a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a malicious intent to redirect 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://gettraff.ru/strik?keyword=engineering+mechanics+books+free+download+pdf In PDF document text
    • http://deduw.dianeaoki.com/uploads/1/3/2/6/132695306/xewazomod-takali-kazenowogu-mesegoweba.pdfIn PDF document text
    • http://files.justuslipsius7.com/uploads/1/3/0/8/130814058/582307.pdfIn PDF document text
    • http://files.tarotevolution.net/uploads/1/3/2/3/132302859/3683981.pdfIn PDF document text
    • http://pugaraxe.springsfbc.org/uploads/1/3/1/3/131380594/lifado.pdfIn PDF document text
    • http://bugejom.far-away.org/uploads/1/3/2/6/132682883/rikaxanonufogak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1303/6439/files/rhythmic_syllables_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0629/8781/files/letters_of_reference_for_volunteers_samples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338a1ce6-9a54-41b4-97cb-f74ef64a1651/nezuxadanevebudobirenef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11858745-6d48-492f-b070-b1eba12b89fd/87720565658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/351a11ed-e4c7-447c-8e6c-b85a6129c5e7/jerinufowitedaxomumit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf316e3-f806-45b6-b671-8d2f3dcf228a/29458282097.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3c949b5-e8fa-421c-b994-30e8460d6fc3/44653055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af8699f2-e275-4b7d-a41d-de5b68a4759b/18017688114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab2983f5-9324-4535-84ea-6bbb2882ca84/90532577915.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_off00006c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C78 5824 bytes
SHA-256: c3b9c99fdf98e8ba5938bc1b1e2f3a51af42380eba5edfa79a8b87569ba68dea
font_01_sfnt_off00008039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8039 10884 bytes
SHA-256: f5adcc21b40e209fe3235c074bde7485b40571ebea213d2d57de025391912e48

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