Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e90c6144d4664d8…

MALICIOUS

PDF

33.3 KB Created: 2020-10-30 16:46:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c9ca3ea8b777d4ab268ceae4a88541f3 SHA-1: 91294e36e0e55aa41cbb8f8e9935be7542dc356d SHA-256: 9e90c6144d4664d80db3f89b55fedc9a02a228114dc37c6732cb74cd3015999e
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 link that redirects to a malicious domain, identified by multiple heuristics as a redirector for phishing or malware distribution. The document body text, though heavily obfuscated, contains the same lure text as the URL, suggesting a social engineering attempt to trick the user into clicking the link. No scripts were extracted, but the presence of a malicious redirector URL is a strong indicator of malicious intent.

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=dna+replication+webquest+wiley+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_5f93907329a51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377113/normal_5f9a595220e07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408703/normal_5f93530283fe6.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/vixuwogetiv/232648363.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/marriage_certificate_application_form_delhi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5662/5829/files/zaxasogavove.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/3497682788.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/bill_simmons_book_of_basketball.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2899/1130/files/19586700107.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/vawuvuvomoxaviju.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/73571950993.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/sat_linear_equations_and_inequalities_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2230fde2-8ffb-4147-97df-f41f98ba3b9c/46147307841.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_off000045a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45A9 5448 bytes
SHA-256: 0716c3072caa74377794f6d517c7e5a1a8d745575eb046ea9e1383047b01b953
font_01_sfnt_off00005861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5861 9424 bytes
SHA-256: b1b214de56ba0d90b7dfa338511c28687611106760b4b7a17a4f8fe8f45a085e

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