Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a33a07c9f359e01…

MALICIOUS

PDF

38.5 KB Created: 2020-11-02 17:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 10a341ec502fea099340bffa6d535512 SHA-1: b7aa4b095f1a6e75d70b7c5bd792accbb6e22026 SHA-256: 0a33a07c9f359e01b6cc8d87ec405b2841b2177782ad4940c241b52140cb91f6
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded URLs that redirect to a known malicious infrastructure, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics. The document body, though heavily obfuscated, contains text suggesting it is a lure for a free download, likely a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

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://ggtraff.ru/aws?keyword=the+essential+world+history+volume+2 In PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/3314470.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409098/normal_5f9b76398d143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_5f8e997507471.pdfIn PDF document text
    • https://zavamemedu.weebly.com/uploads/1/3/4/3/134305249/xajupomidil-zexaxo-giwededimunenat-mabufafifeziwop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412151/normal_5f964bbba282c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_5f9f57a512d60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5f8f295028cbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380871/normal_5f8c9788dd1c0.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/719840a0-1dd2-4a37-9906-927d385aa27a/73567753718.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3301/5958/files/vogoxubage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2ab62b4-ef83-45b2-854e-351a896391ca/16185482183.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4378/9727/files/aha_guidelines_2020_cpr.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/2389/0118/files/what_does_dragon_fang_do_in_pixelmon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5139/1389/files/dalton_thomson_rutherford_and_bohr_atomic_model.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_off000057e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57E8 5400 bytes
SHA-256: 1ddfcbdeb0d47b187e39b48b4cebed92926855833ef49efa409937c55feb1a5f
font_01_sfnt_off00006a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A35 10308 bytes
SHA-256: 9b194fe88e822e917871dec1c55b831f6b88a8e9cf2f6f66f544f5801f90c3f7

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