Malicious PDF — malware analysis report

Static analysis result for SHA-256 6572f890b8ad5049…

MALICIOUS

PDF

38.8 KB Created: 2020-11-01 20:36:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6c9b25c66c1f117fbafd6a0a338c3e47 SHA-1: 3a32c0a73016c1f0e2a8c885859697515dad4de7 SHA-256: 6572f890b8ad50499d133622a8abb0be956ebe32fbd9b8cf6b01af40f161491e
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector infrastructure, specifically 'https://cctraff.ru/123?keyword=accustom+crossword+answer'. The document body, though heavily obfuscated, contains text fragments suggesting a 'crossword answer' lure, aligning with the heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK'. The ML classifier also strongly flagged this PDF as malicious.

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://cctraff.ru/123?keyword=accustom+crossword+answer In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5f87fe9e41d6b.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/1/0437/0225/5770/files/kapido.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5735/5173/files/nmms_meaning_in_text.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/86835755474.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/7625/3375/files/19045736543.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7659/7915/files/mame_wii_channel_installer.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/2754223351.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7250/2942/files/xibajerobafeno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8776/4887/files/21373387398.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6999/5691/files/83647050779.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59BD 5132 bytes
SHA-256: be9520ded2410cdbca30146674d79ceb8b6777e0fa47b1a71384cd41b3777ae8
font_01_sfnt_off00006b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B2B 10568 bytes
SHA-256: 134e6cc7521f66edd6a95d6fb286386a298a70432545acc29d4a693b46cfff59

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