Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad1e4e2f7fe94c5…

MALICIOUS

PDF

40.5 KB Created: 2020-11-04 02:42:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 275692399dd7ef4757a76e62da9f2157 SHA-1: 18160b4c612844753320220876c5132a6771efd8 SHA-256: 3ad1e4e2f7fe94c528e596c399680bba0b939fcc2236292fa438ee8bc2c21e8b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm designed for SEO manipulation. One of the primary links, 'https://cctraff.ru/aws?keyword=point+slope+equations+worksheet+answers', is flagged as a malicious redirector. This suggests the document's purpose is to redirect users to potentially harmful websites, 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/aws?keyword=point+slope+equations+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_5f906bc3037a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_5f9c9f0eb4e76.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/kegevegizufifim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384632/normal_5f9c492c65982.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/pebudo_tataz_busezefalikir.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/jeworurowam/luxolavojimelezomedad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3295883-780c-4197-880d-6f9e4b96d151/65974378451.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/gowajofitoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/744b4a8f-29d8-4668-9bfc-099e7b70a887/96033618460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e770e8-03ab-43f5-abbe-d7ec71c45a2a/clasificacion_de_carreteras_en_ecuad.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/dulitugerowurojamogova.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/tirafajejukokefabugasul.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/wojokeni.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_off0000521a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x521A 5072 bytes
SHA-256: 93ede4e2f0287a7294c9f2c2a028fd0077419f6d3a873722681eb2587c1b057d
font_01_sfnt_off0000635c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x635C 10392 bytes
SHA-256: 4bc00d8e14828c245212e1d88db5b1e2edd72d852ff0cf22b157152f08023018
font_02_sfnt_off000086fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86FE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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