Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df81d9c321bdb9c…

MALICIOUS

PDF

64.8 KB Created: 2021-01-04 08:53:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d9b9c2db2a35418ef3069347be90ffa7 SHA-1: 963eff45ffdb6b0a600075c198a86cd01c603034 SHA-256: 8df81d9c321bdb9cf7c2e7cec4be4988b8fc0ad69784ceaef06969b6ffdb368f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'gettraff.ru'. This URL is presented in a context that appears to be a search result for a 'Batman halloween costume toddler'. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to S3 buckets. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=batman+halloween+costume+toddler In PDF document text
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/9056575.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/5a2e20d42e55.pdfIn PDF document text
    • https://wugowimuvup.weebly.com/uploads/1/3/4/7/134762233/c9e8071e.pdfIn PDF document text
    • https://vujedivu.weebly.com/uploads/1/3/4/7/134768767/kutafez_kiwax_soxaderuni_nazebotiju.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/widuxade/elsa_sheet_cake_ideas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45c87f66-b042-4818-bd38-7022901d0958/66276793512.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/fur_elise_piano_sheet_free.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/ragetozipuzoj.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/cheese_in_the_trap_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/hungry_dragon_game_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/wugokedogamebaputunopej.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/89763940141.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/akeeba_kickstart_joomla_1._5.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_off0000c295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC295 5320 bytes
SHA-256: 81bade963a7bc458be4ae5d1a3e4ae1f893d767da4dfa5d4dbfab71d5f265e19
font_01_sfnt_off0000d491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD491 9920 bytes
SHA-256: 24484b49be7f4ad5338fb783b8288959d9cffe9b5d02d2c1769c15dbd2ec9c25

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