Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9047acbdcb8627…

MALICIOUS

PDF

41.3 KB Created: 2020-10-02 11:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: f31683d17c9f15f921a0a213f398c17c SHA-1: fb585833fdb7a3f7895e017f5c6c5957a2e733ef SHA-256: bd9047acbdcb86274cc8c1860f57eb771e603c4dd27932acab95e091f5302af8
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://ggtraff.ru/strik?keyword=free+compound+subject+and+predicate+worksheets In PDF document text
    • https://site-1039811.mozfiles.com/files/1039811/nojusexurenetirokibalit.pdfIn PDF document text
    • https://site-1038477.mozfiles.com/files/1038477/totefupipexexegadufifa.pdfIn PDF document text
    • https://site-1038332.mozfiles.com/files/1038332/zanevinerow.pdfIn PDF document text
    • https://site-1037035.mozfiles.com/files/1037035/95902743672.pdfIn PDF document text
    • http://lemevi.freebackgroundphotos.com/uploads/1/3/1/4/131407668/820924.pdfIn PDF document text
    • http://misel.losachicboutique.ca/uploads/1/3/1/1/131164250/6a033730.pdfIn PDF document text
    • http://fazutot.sarahckart.com/uploads/1/3/2/3/132303079/fetuvijevorulur_durajiwetu.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/1/0432/7286/3899/files/dd_ravenloft_espaol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9996/6628/files/mabotuwiduluxazigejod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0151/0045/files/beduvix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3771/5363/files/fire_flower_mario_coloring_pages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01f77d83-f5d3-4381-aa30-5bfd6ef745c9/26000173983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e441da38-de6c-4afd-b4e7-75bc2017d1b9/75433758458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4c016d5-011a-4bde-8135-06f6203e6b03/51599585792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/029b6311-5d01-45d2-a574-7aefa35bff85/57538277854.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_off00005e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E85 5608 bytes
SHA-256: 981a6599a26bf08a56ba3940667fd3c31514ece1be0dc7d862e0a7e0c60a1859
font_01_sfnt_off0000717b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x717B 11724 bytes
SHA-256: 17f91a561eb972425697ca4087301e9a29ead87b5a0965d54842cc89adf9496b

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