Malicious PDF — malware analysis report

Static analysis result for SHA-256 027a720260b76ffc…

MALICIOUS

PDF

77.0 KB Created: 2020-10-26 02:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 016f5bfabb4c813044e254e78fcbd8d1 SHA-1: cb7972c8cf18b4f00c8a7bf6244ea8fa6a823ee0 SHA-256: 027a720260b76ffc3a4934aae833f3f1ed26692e76dc50e8453647f601a6ea14
142 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link disguised as a download button, which redirects to the known malicious URL https://cctraff.ru/123?keyword=management+science+textbook+pdf+download. This indicates a phishing attempt to lure users into downloading potentially malicious content or visiting a compromised site. The ML classifier strongly supports the malicious verdict.

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=management+science+textbook+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392462/normal_5f95f8efc6612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f8971bed7da2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383304/normal_5f9601ccd75ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382197/normal_5f93d7104f4f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405904/normal_5f960da13f413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393752/normal_5f8f052339408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_5f8d60bce88bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f871039e9fe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5f8ca20b11f37.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/henghuili-files/solidworks_tutorial_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/999f389f-f80b-40f4-af1d-99f12c0b72fd/zesetijalewutujubax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34de646d-8e8e-4731-8ad9-ca074de9f6d3/kimejorizoroxetamokiribo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a691b5c-1ea9-4021-a79c-e52e44c60528/pogoduturuwitigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deec6f40-60e5-48d7-ad10-e10437dc69c4/sitekekegubag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31c494d9-8008-419c-8773-63ec116508e8/73342735217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e49c06ed-02ed-471b-afad-4abc7d49a742/66359806176.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_off0000e267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 5748 bytes
SHA-256: 64f1c593d22a9ed74a61ab105b926d21c0586be5a3f7affc65a101d3811b28d4
font_01_sfnt_off0000f5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FF 15204 bytes
SHA-256: 2665360026c76dbfba947fc86870b11f150747ce108ba68a25b0d9597869fb2c

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