Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb3a4041c0c9430…

MALICIOUS

PDF

60.7 KB Created: 2020-10-29 06:49:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a9c0abc60d68b16443b5d6e39c1c59fd SHA-1: 9de892b0a23b257fdde264787dccc41ef4cacd0c SHA-256: 4cb3a4041c0c9430f3bb5107fa2ccdbfeb7f5ee6c547a311f948b4edd0be166f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains URLs that are likely part of a link farm designed to distribute malicious content. The ML classifier strongly indicated maliciousness, supporting the conclusion that this file is used to redirect users to harmful websites.

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://ggtraff.ru/strik?keyword=freedom+of+movement+petrification+pathfinder In PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/ae959.pdfIn PDF document text
    • https://xosetumigex.weebly.com/uploads/1/3/4/3/134371377/komelasuju-rubuw-jovoto-xumirunubuxezu.pdfIn PDF document text
    • https://kezobonuduwu.weebly.com/uploads/1/3/4/4/134457579/3382027.pdfIn PDF document text
    • https://bizitodavil.weebly.com/uploads/1/3/4/3/134321392/xiwoxar.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/7236141.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zetare/12th_maths_formulas_list_ncert.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/sapawogimawi.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/sample_leave_application_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/drug_abuse_in_youth.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/ziliruj.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/wupixobugadenepuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/sepuful.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/9799/4439/files/wimopon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/1970/5761/files/vugedaf.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/the_ambum_stone.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/38066681537.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/calendario_laboral_2020_catalunya.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1378/3199/files/vomikezetizidefirorusave.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/canara_bank_statement_format.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/salesforce_interview_questions_and_answers_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/ruvutomuxepakedukuwa.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_off0000ab2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB2B 5200 bytes
SHA-256: 9bc90b3736ebb340254d03327f7a5b5d7b78d6c544af48f2b39589f91fb18cda
font_01_sfnt_off0000bcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBC 11912 bytes
SHA-256: 5aa392f92b2223f4669187530b92907949ab8d6b96d232433948422843cd8b34

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