Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac3acfec43857c4…

MALICIOUS

PDF

42.6 KB Created: 2020-10-26 00:25:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 70aed7f810ad2d196f696a2d38205bd4 SHA-1: 6527513462fc4a0b3c4c28026bf8b2a158cdf6e7 SHA-256: 1ac3acfec43857c49b82fcb038a943b84bc1cd927bfe2a267e2e7bf1edc752e0
194 Risk Score

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://cctraff.ru/strik?keyword=%25D0%25BA%25D0%25BE%25D0%25BD%25D1%2582%25D1%2583%25D1%2580%25D0%25BD%25D1%258B%25D0%25B5+%25D0%25BA%25D0%25B0%25D1%2580%25D1%2582%25D1%258B+%25D0%25B8%25D1%2581%25D1%2582%25D0%25BE%25D1%2580%25D0%25B8%25D1%258F+%25D1%2580%25D0%25BE%25D1%2581%25D1%2581%25D0%25B8%25D0%25B8+6+%25D0%25BA%25D0%25BB%25D0%25B0 In PDF document text
    • https://jobubati.weebly.com/uploads/1/3/1/4/131453688/binebigizos-xupinarop-zasijew-naxun.pdfIn PDF document text
    • https://zirufifun.weebly.com/uploads/1/3/0/8/130874679/tanixoson.pdfIn PDF document text
    • https://fawubanine.weebly.com/uploads/1/3/4/3/134321827/tonag.pdfIn PDF document text
    • https://wizamezuladad.weebly.com/uploads/1/3/4/3/134351213/82151d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375909/normal_5f938685ed730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5f8ec3e309c17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410983/normal_5f95d5d552d63.pdfIn PDF document text
    • https://cctraff.ru/strik?keyword=%25D0%25BA%25D0%25BE%25D0%25BD%25D1%2582%25D1%2583%25D1%2580%25D0%25BD%25D1%258B%25D0%25B5+%25D0%25BA%25D0%25B0%25D1%2580%25D1%2582%25D1%258B+%25D0%25B8%25D1%2581%25D1%2582%25D0%25BE%25D1%2580%25D0%25B8%25D1%258F+%25D1%2580%25D0%25BE%25D1%2581%25D1%2581%25D0%25B8%25DIn 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/1/0430/2707/1127/files/konorokemofupelefoja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/6178/7805/files/ps4_remote_play_android_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e21265bc-fa4b-4fb1-877b-df665dbce260/37066869107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8463a382-a2ac-4df9-a45a-3059dc6ad99d/mowijosibulojik.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/free_trade_advantages.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/55161057081.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/gst_detail_in_hindi_download.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/mevasubedam.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_off00005b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B87 5672 bytes
SHA-256: b5e64dc7bdc87f7540eca3d2bfd248a5d070072a6c45e99a7b3e89ff3fbfe5be
font_01_sfnt_off00006e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7A 13992 bytes
SHA-256: 4b12bf72fbe4b1c8d17fc5e0de753a4c11711ce3d9d7d88e2bd071359f1927d5

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