Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdad2a237b0f6d1…

MALICIOUS

PDF

39.5 KB Created: 2020-10-08 10:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: 13c089920f30892e4e10c419ea49467a SHA-1: a7149e19b3e0d13c352f437383d6596134d202d6 SHA-256: 7bdad2a237b0f6d10bc13e300ffd4038d32d292d67690c04e8e4c7667db9130a
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=prefix+and+suffix+worksheets+for+class+5 In PDF document text
    • http://regon.timbertowncoffee.com/uploads/1/3/1/6/131637814/6c046836da2e2.pdfIn PDF document text
    • http://kozonib.saracoursin.com/uploads/1/3/1/0/131070289/sobefovibuxigof-maxisetim.pdfIn PDF document text
    • http://dawigo.justinedaisuke.com/uploads/1/3/2/6/132695780/2b81ae5d.pdfIn PDF document text
    • http://viseta.anastasiasmitharts.com/uploads/1/3/0/8/130874380/jekejexurub-suposovarelotot-loteminiled-tevepive.pdfIn PDF document text
    • http://tubabe.drkaylapeak.com/uploads/1/3/2/6/132681946/4040213.pdfIn PDF document text
    • https://site-1036621.mozfiles.com/files/1036621/jibufakufelatok.pdfIn PDF document text
    • https://site-1039167.mozfiles.com/files/1039167/11208672526.pdfIn PDF document text
    • https://site-1037230.mozfiles.com/files/1037230/vezunuxibirokapofo.pdfIn PDF document text
    • https://site-1042100.mozfiles.com/files/1042100/23849065474.pdfIn PDF document text
    • https://site-1044106.mozfiles.com/files/1044106/fopudovo.pdfIn PDF document text
    • https://site-1039307.mozfiles.com/files/1039307/kuputorosuwewufirimugada.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/1/0496/2392/4885/files/rolling_thunder_vietnam_song.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0807/1576/files/40755740327.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4132/7774/files/the_arbor_documentary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3892/3169/files/dusuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7304/4634/files/pujavuluvejaxokisas.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_off00005d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D31 5460 bytes
SHA-256: b07b522854ffa122519d727ea75e368c145c8e44b660e76be9369defb3153738
font_01_sfnt_off00006fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDE 9740 bytes
SHA-256: 96f11414e387f9e3e8da1f04ff8fe45b0f21188c5a84b990dae4ad7aab4cff87

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