Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53a501d85ed4c14…

MALICIOUS

PDF

50.7 KB Created: 2020-10-05 21:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a70e09b65b9673dd28710dad90b17093 SHA-1: b1ed6c02eb1f997557e0881b5d481dca4720bce8 SHA-256: f53a501d85ed4c142b097c0c9ba32d828ea39ad225037678b6f10c8474a3fa7a
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?keyword=campbell+biology+textbook+9th+edition In PDF document text
    • https://site-1038967.mozfiles.com/files/1038967/17540311921.pdfIn PDF document text
    • https://site-1044310.mozfiles.com/files/1044310/zobin.pdfIn PDF document text
    • https://site-1041085.mozfiles.com/files/1041085/vikizabufajebivebib.pdfIn PDF document text
    • https://site-1038770.mozfiles.com/files/1038770/35730504131.pdfIn PDF document text
    • http://files.ovlkdsob.com/uploads/1/3/2/3/132302857/japodepilesunupi.pdfIn PDF document text
    • http://wakija.misadaitg.com/uploads/1/3/1/3/131398164/suxaven.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/e0575bc0-9839-4c68-8e15-cf07daf59544/ruvusik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29795ff6-9d8e-4a38-b613-4bf34cf523ce/nupevozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a5b446-6b2c-428e-8f92-c8766131d48d/bawisitoledibotuzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38fb2075-4137-47fe-b433-eb20b95243c3/binijitatawife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b039fdda-ee17-402f-8fbe-07aca8d49e1c/mafixefodog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb396644-c8ac-427d-8237-c623b8dd9a57/12461878715.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_off00008163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8163 5532 bytes
SHA-256: e2528d4ab1c34595d7b10092ae91023fcbfb7cdd3277167002e6d2ea9f02418d
font_01_sfnt_off00009411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9411 12636 bytes
SHA-256: 70e8b562487820379cf84d5322175125b2780523d9744af21653d77dc1cb7c8d

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