Malicious PDF — malware analysis report

Static analysis result for SHA-256 668f976ba13748d2…

MALICIOUS

PDF

36.7 KB Created: 2020-11-04 23:36:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9ab03a805cb5e25d0a85522a6e2e7001 SHA-1: 3c292932d7489f90027304b9c0e30e0e6f9766e3 SHA-256: 668f976ba13748d21ec61693a13c181915932124d55b6d730dc085ca8638bd8f
134 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 'https://cctraff.ru/123?keyword=our+gang+s+menu'. This URL is also flagged as an SEO redirector, commonly used in phishing campaigns to obscure the final destination. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs and appears to be a lure.

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=our+gang+s+menu In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410956/normal_5f9f97cab38f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f9f37688db50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379970/normal_5f9fd532541de.pdfIn PDF document text
    • https://ganarusi.weebly.com/uploads/1/3/4/1/134109047/3532506.pdfIn PDF document text
    • https://dowikonusinewe.weebly.com/uploads/1/3/4/3/134374018/togajofap-naduxu-nojeresa-tuvulebuva.pdfIn PDF document text
    • https://rixokofumi.weebly.com/uploads/1/3/1/3/131380985/wizevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_5f89147927f2d.pdfIn PDF document text
    • https://bevokelas.weebly.com/uploads/1/3/4/3/134310014/2546234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419430/normal_5f9885f81db64.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/remufuzu/21526745494.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/lajevurenesakuxiki.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/advanced_english_dictionary_download.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/54519979235.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 8

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_off00005464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5464 5000 bytes
SHA-256: 4651603b0fcdc5d58a9bf37e5d031caebd1ce29d402d422c8b15730a7419c266
font_01_sfnt_off00006551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6551 9776 bytes
SHA-256: 0b692b114f6685ba7cce95b181209272af734b54a38571a5758f2a116208c692

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