Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ecbc62b56a5af3…

MALICIOUS

PDF

44.8 KB Created: 2020-10-31 04:12:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 91aea4238c15aa9b762c5404926c875a SHA-1: 3899ff31b17e9ff600d440bae5023330378b28c8 SHA-256: f6ecbc62b56a5af3ebb5483c8d1d97cdb91735464cc5a472b0a979181904b71d
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector. The primary redirector URL, 'https://cctraff.ru/aws?keyword=group+6+elements+form+hydrides', is identified as a known malicious redirector. The document body, though partially garbled, also contains this URL and other links pointing to S3 buckets, suggesting a link farm or phishing lure. No scripts were extracted, but the embedded links and redirector heuristic strongly indicate a malicious intent to redirect users to harmful sites.

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=group+6+elements+form+hydrides In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373782/normal_5f91fc2fef294.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/pewebopufupe/new_sepsis_definitions.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/87819842754.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/96716187760.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/gta_san_andreas_all_cheats_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/alphabet_japonais_franais.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06c58c60-5317-42fa-9ae7-5582d97c78c7/16548054972.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0510/3933/8661/files/59811517247.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/wolukofijudojediwokad.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_off00006d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D71 5360 bytes
SHA-256: 6b926f0eafb609d27a68e8a0e8e758f6ff877b03b67ace7b9aa312bb4ec5ff02
font_01_sfnt_off00007f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F90 11632 bytes
SHA-256: a11d01a1741b3f71cbdcbb8ef992ebed1bd26148dd64374dd64efaaef01a0d04

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