Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5c8671e9e63212…

MALICIOUS

PDF

41.8 KB Created: 2020-10-12 04:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 2d33dabf403e1a8b9e6df12e131025eb SHA-1: e245b650c41c6f409b64b854cb85775658aad620 SHA-256: be5c8671e9e6321237e06e8d11f83701080861b4113e817a56ead10716123fff
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/pify?keyword=acsi+spelling+bee+word+list+2019+3rd+grade In PDF document text
    • https://site-1039658.mozfiles.com/files/1039658/zidukowolozulewupow.pdfIn PDF document text
    • https://site-1040140.mozfiles.com/files/1040140/36186012034.pdfIn PDF document text
    • https://site-1039224.mozfiles.com/files/1039224/wedoveposetopakivosub.pdfIn PDF document text
    • https://site-1043471.mozfiles.com/files/1043471/27825909859.pdfIn PDF document text
    • http://zujeg.rencommunicatons.com/uploads/1/3/2/6/132683286/fasumefipabowo.pdfIn PDF document text
    • http://wufoluwom.restoreplus.org/uploads/1/3/1/8/131872055/9858488.pdfIn PDF document text
    • http://files.lamodemagazine.net/uploads/1/3/2/6/132695306/gunevud.pdfIn PDF document text
    • http://somide.bigbadbearband.com/uploads/1/3/1/3/131383483/senuteniretoba-funom.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/1/0427/5834/0774/files/atari_game_price_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0562/6536/files/zojixiwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3124/4195/files/nuvuzurijotubaromok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6698/5122/files/dajakifowexebejem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3867/3562/files/authors_word_choice_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38f0a618-0e5f-4125-93ad-df879631c9ee/31900343627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bd12860-e45c-4551-a69a-5a8c1ce1a467/48869744658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccc3f8ca-59f1-42f9-bce0-8397ff004cdf/89797251435.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_off0000617c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x617C 6108 bytes
SHA-256: b7273c42ba0c511c07f71af8451403ff47414472a6d468a9b305f8cea9cea5b9
font_01_sfnt_off0000764d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x764D 10328 bytes
SHA-256: c67f594d442053b4fc5e2c1a502c4efa06a530672754a1695ba3a068230ed45d

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