Malicious PDF — malware analysis report

Static analysis result for SHA-256 01bb0c928b3c15d4…

MALICIOUS

PDF

68.9 KB Created: 2020-11-01 22:10:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 75e3171c0423bfef1494d5756de6554b SHA-1: 9cf77b3c515541586c614080d542c71ce4ca2068 SHA-256: 01bb0c928b3c15d49c960ab710aebce770e4dd642210e0f306410bfe684325e5
194 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate educational content, but it redirects to a known malicious URL. The primary heuristic indicates this is a malicious redirector, likely intended to phish users or deliver a second-stage payload. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=reading+plus+answers+level+hie+reddit In PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/239cd.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/e7dca301.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/1/0500/6914/3708/files/polinomios_de_taylor.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/constitution_and_bylaws_of_ssg.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/moridaselijapor.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/springfield_missouri_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/1111/8507/files/55020049057.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/4251/0277/files/hells_kitchen_recipes_risotto.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/tajuji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9187/6759/files/north_west_university_prospectus_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6905/8455/files/nojafurafusasulikimamoron.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5404/6618/files/bank_of_america_merrill_lynch_acquisition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3393/5519/files/godaddy_domain_buy_service_reddit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2453/1101/files/42056878659.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_off0000cc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC38 5380 bytes
SHA-256: b12034f957e8e3a91fc905e670c22615d478353861611383edc403c759f2725c
font_01_sfnt_off0000de9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 14788 bytes
SHA-256: 92cff172baabfa542e5e363bcdcdc190842b9393d90ea35d61dbb28b55f2efbf

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