Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb47797a7a881ae…

MALICIOUS

PDF

44.7 KB Created: 2020-10-28 23:31:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 31712048c9e3ad276b0147c8b21138c7 SHA-1: 8cf6f8e0ebd4a6d31a05fc9a131fb95bae62d74c SHA-256: 3cb47797a7a881aee155b45489ef75e4d744c897c27ee67a9e3de515c5d5e960
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 malicious redirector link, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic, which is designed to lure users to a potentially harmful website. The ML classifier also strongly indicated maliciousness. The presence of embedded URLs and the nature of the redirector suggest an attempt to trick the user into clicking through to a phishing or malware distribution site.

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.link/123?keyword=ruby+in+paradise+cast In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374840/normal_5f96a1ead4b51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379970/normal_5f95541623015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5f87623740943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_5f94a07f6915b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f87350a4005d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393503/normal_5f98d16fa5f83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368265/normal_5f879f0f02315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367938/normal_5f88066da44f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369912/normal_5f89d0dc1943c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_5f8bae4fdd7e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418191/normal_5f9990b627c6c.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/dc5d29eb-b48c-4cb6-8ba8-9775e7a929b7/gejusivezedeziz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/417e8394-186c-4f39-8386-0a87c3112b15/64574085038.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/pujas.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/72166488696.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/printable_bulletin_board_borders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88f8cc98-404d-4577-819f-c18519552d02/minecraft_14.0_android_oyun_club_ind.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/backyard_burger_nutrition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97e9bcaf-3873-4a6d-8d3a-25d30e3a3ad7/39199487399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2852cca4-ada8-4787-b367-7df7b6b6f578/55730953481.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/99980710751.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_off00006c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C38 5284 bytes
SHA-256: 0beae8dd6c696105be92fe59c786dfbd57e4ceb4c12da2c7874b6a3a60d41cd1
font_01_sfnt_off00007e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E41 11936 bytes
SHA-256: fd3c76b6f10a03d63790236e70e063463ad0e9d2dfdf5fd7756dd773a655f62f

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