Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e769af065c3364…

MALICIOUS

PDF

94.5 KB Created: 2020-11-14 03:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 09f5bf30c7efa5523109480f96c0c4d3 SHA-1: 385281bd4c25390ebe3d695203ee7be99346168e SHA-256: b0e769af065c3364d4ab15a4e3165f38825b5e2cc368a29e6a49e9a1ef3b8fe5
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, one of which points to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of malicious links is sufficient evidence of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/aws?utm_term=converting+parametric+equations+to+rectangular+form+calculator In PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/norivutopezufet.pdfIn PDF document text
    • https://kuvikupomudu.weebly.com/uploads/1/3/4/4/134457818/ketam.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/mipizaju/14498344100.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/91618761456.pdfIn PDF document text
    • https://s3.amazonaws.com/pofumapetat/free_printable_monthly_planner_2019_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33355a3a-1dcf-4463-aead-8788b0fcd9da/situxelawopulafimovizo.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/zirubunaxilopoponi.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/best_netflix_movie_drinking_games.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/81687732934.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/liga_de_quito_copa_libertadores.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/2463746375.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/priyanka_chopra_house_mumbai.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/letter_of_request_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/10508334912.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_off00012408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12408 5428 bytes
SHA-256: 780f05b86d889981af3648bdf8af3f34ee1410ad542819904d373ae9b4152d63
font_01_sfnt_off00013672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13672 11948 bytes
SHA-256: 281fc3ac0ed230cfb6a3712fe437a8cf2e6f87cdcbc7d720c9dfd0df99fdb679
font_02_sfnt_off00015eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EB0 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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