Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5ed08f6d408bdc…

MALICIOUS

PDF

34.7 KB Created: 2020-11-06 01:43:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: 84bfd10cbf30eb72d9fffa9421028dd7 SHA-1: 6e009b639eefaeb963cba107d925bb12df8906e6 SHA-256: 4c5ed08f6d408bdc8e7092ef7e53c6ca3187876f9bbf2684f34b2dea4965f56d
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a redirector link to a known malicious domain, likely for phishing or malware distribution. Another heuristic indicates a link farm, suggesting SEO manipulation to drive traffic to potentially harmful sites. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffking.ru/aws?keyword=mr+kang+manga+46 In PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/3344331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_5f881e01c5340.pdfIn PDF document text
    • https://nimubawelekuf.weebly.com/uploads/1/3/4/2/134265751/lufajagavo_pezeg_womowog_mofijot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zosevid/paradoxo_da_escolha.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbdbec7f-1d09-4657-adb1-757c51b111ed/the_green_mountain_boys.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/list_of_poisons_and_their_antidotes.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/reduce_size_mac_adobe.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/breakfast_sandwich_maker_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd213d8b-8b7d-4abb-9324-b1ac9072becf/55995212749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1afa21f1-c3c9-45ee-a677-81c2c3dc6779/how_to_use_discord_server_widget.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/pexirajoxutuwusixan.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/gavumebejamabezexim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24af3765-b725-4fcd-be7f-719c3aa5817e/94502060522.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000402e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x402E 4536 bytes
SHA-256: 19a87ffe095503095948e27a4211c4cef6b0a3d7bf71c603fdc9152708757b57
font_01_sfnt_off00004f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F6D 9528 bytes
SHA-256: 02caae6a5c23b540695c4b07171d8f3d1c321e1102d2f418765e8e76547ad334
font_02_sfnt_off00007048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7048 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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