Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47cbd92698351d5…

MALICIOUS

PDF

40.6 KB Created: 2020-11-04 05:44:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fe50f0e6dc343e1742b3b509dad7511e SHA-1: 1daf99ff89fe5549573c098f3b29644e4f8f1ab2 SHA-256: f47cbd92698351d5237ddc7dac179aad9c2bc3777e17143ba1680977d7bb8561
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://cctraff.ru/123?keyword=lorax+worksheets+middle+school+pdf', which is also flagged by heuristics as a malicious redirector and part of an SEO link farm. This suggests the document is designed to lead users to malicious content, likely for phishing or malware distribution.

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/123?keyword=lorax+worksheets+middle+school+pdf In PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/puwufibutorevegos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369329/normal_5f8ea08fbf3f0.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/movew.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/lewudebe-wiberiso.pdfIn PDF document text
    • https://misikeni.weebly.com/uploads/1/3/4/3/134336029/257883.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/sabobenuwe/14687523213.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/lvl_guide_lotro.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/arthropod_phylogeny.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/augustus_of_primaporta_20_bce_roman.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/dafuxijerabiwumunewuj.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/25786099591.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/japena.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/bbc_janala_english_learning_book.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_off000060d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D5 5560 bytes
SHA-256: 2ecc66a555e3acb508b57f90a9ab9f1e92770402f6e773a68bc4217e78897838
font_01_sfnt_off000073b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73B0 10040 bytes
SHA-256: 5f30d362aae9f106a1c855d50dad6d49f7be64cb7bfb63998225ea201f3c58cb

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