Malicious PDF — malware analysis report

Static analysis result for SHA-256 aecd9417b881fd64…

MALICIOUS

PDF

40.1 KB Created: 2020-10-29 14:25:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b1e7392913190d0cffae3d466ab4ed24 SHA-1: ef88ec6f1f4923e8371893bfd76823e88bfc456a SHA-256: aecd9417b881fd646618beaf45f956e50644d82dce7a0d5360115ff51f43bfa0
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, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, includes the same URL, suggesting it's the primary lure. The ML classifier also strongly indicated maliciousness. The presence of embedded URLs and the redirector link strongly suggest an attempt to lead the user to a malicious site, likely for phishing or to download a secondary payload.

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://ttraff.me/123?keyword=count+of+monte+cristo+settings In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408866/normal_5f94a92a8a62e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_5f93f98fbed59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388178/normal_5f93ac1809600.pdfIn PDF document text
    • https://saniluje.weebly.com/uploads/1/3/4/3/134323688/3bd0a63ac3964.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3364e0a-6da6-406c-8529-21f69b5dce7f/kuwejutuvanurivusorun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7347cd15-6979-4599-8380-7e11ebcb91a3/avs_video_editor_7.5_crack_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/4246/2618/files/prokofiev_montagues_and_capulets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fc80883-6ed3-43ae-8133-d0ecf1800113/vovagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03c917a6-5ed5-47e2-ab85-61e927bbdc82/8901891992.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_off00005f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F97 4864 bytes
SHA-256: 53477963113b6f3de9367f7f61bd64c227b14b81fce5375c058a402ad548acbb
font_01_sfnt_off00007010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7010 10804 bytes
SHA-256: de345ab4f4b39b4fe47652df2009089d421a952596403cd20c0cc24abcf7db5a

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