Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b5be79c42b3c79…

MALICIOUS

PDF

43.4 KB Created: 2020-11-04 14:42:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0cb56ffca723fff077a37667d2136870 SHA-1: e67427db8630bb8f277a3df5e3f41002e3b83003 SHA-256: 83b5be79c42b3c792fdde211a3e56807aa527e6caf15ae8641951a67215502d5
134 Risk Score

Malware Insights

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

This PDF document contains embedded links that redirect to known malicious infrastructure, specifically `https://ggtraff.ru/aws?keyword=clockwork+angel+pdf+free`. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's a redirector designed to lure users with a free download pretext. While no scripts were explicitly extracted, the nature of the redirector suggests it's part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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://ggtraff.ru/aws?keyword=clockwork+angel+pdf+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412584/normal_5f97aac143f78.pdfIn PDF document text
    • https://wimixexaselu.weebly.com/uploads/1/3/4/3/134324609/f840c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_5f9e5b0926b1f.pdfIn PDF document text
    • https://regukabomuvan.weebly.com/uploads/1/3/4/4/134471867/sotutipo_xewevibodu_xetufegis_mulesabo.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/kezedivalo-bolumukejufufik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379719/normal_5f8e72a95e377.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/memul/94386632939.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/movies_with_greek_subtitles.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9957/3410/files/angielski_w_tumaczeniach_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c78d8de1-5a92-4be2-9e63-408928418156/nibujinenuwe.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_off00005dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFC 4984 bytes
SHA-256: d9ca8e151beca39bd329e525296cdb753ab392ad67a88baab463901bba6c2c6e
font_01_sfnt_off00006f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F04 10908 bytes
SHA-256: ba89568c459b999108dfe19658e9941135757dd89d4643b08fef7f110c6e83dc
font_02_sfnt_off00009302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9302 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34