Malicious PDF — malware analysis report

Static analysis result for SHA-256 42349c398cc8f0dc…

MALICIOUS

PDF

43.6 KB Created: 2020-10-30 14:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: be89cc2c71a64c1bde55d4e6e16a862c SHA-1: 9e444217305b5f81eee806c42e512ec3326e4430 SHA-256: 42349c398cc8f0dc5cdd84c3c572d6000408bf5d6e8d84864cac99b9532d2739
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_UTM_REDIRECTOR_LINK heuristics. The document body, though heavily obfuscated, contains text suggesting a lure related to 'The umbrella academy comic pdf descargar', aiming to attract users through search engines. The ML classifier also strongly flagged this PDF as malicious.

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://gettraff.ru/strik?keyword=the+umbrella+academy+comic+pdf+descargar In PDF document text
    • https://totobulamu.weebly.com/uploads/1/3/4/3/134310137/tujineb_farinakaxufoki_litiwen_ludozemimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5f92b20b10166.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/3632/2203/files/similar_shapes_proportions_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5697821c-9d85-4b52-a8b9-6f6571078959/29138871554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/867c43fa-041d-4978-b790-ce9f5008e9b0/gimiwijix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9a35c52-227d-4ee8-827b-9b10db7bcdb6/6890800036.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/3605/5973/files/up_police_recruitment_2020_notification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e9004f-0fe3-4a3b-b147-88db4ab452da/magavisuwatuvidiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1274/1529/files/summarizing_and_paraphrasing_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22735e16-59d1-4a70-89a0-7bf92e1851cc/25589474557.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/8997/5214/files/26869463374.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/redawapejasefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cbaf612-f126-4c37-a7e9-8a38aa67ba6d/24351570508.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_off00006842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6842 5760 bytes
SHA-256: 6f85ea86a752b9fdbb9b56499cab2a556b3e6c113cd09f02aaf2196a2197359b
font_01_sfnt_off00007bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB1 11288 bytes
SHA-256: 6ad0a4a5ca3ca017ed32d3522c27f4940d3b96a1bf0781689f2ac4404e2fdbeb

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