Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8cd53d08530bcc2…

MALICIOUS

PDF

46.1 KB Created: 2020-07-30 07:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 00a9052448580c331411cd45ab69889a SHA-1: 2ae0ec63d19756bd403f106eeb6d9a859add3746 SHA-256: f8cd53d08530bcc246ea321753361cfe2b532d291c2f064b5e4230c3d217945f
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://ttraff.ru/pify?keyword=background+piano+sheet+music+pdf In PDF document text
    • http://files.atec-rental.com/uploads/1/3/1/6/131606325/tawopimepavukeg-sadafikijilil-bivobegalawu-jalelem.pdfIn PDF document text
    • http://files.neuroocenter.com/uploads/1/3/1/6/131636984/fixomo.pdfIn PDF document text
    • http://files.pinakainteractive.com/uploads/1/3/0/7/130739991/7514418.pdfIn PDF document text
    • http://files.poinsettiadrycleaners.com/uploads/1/3/1/8/131871618/mijibem.pdfIn PDF document text
    • http://files.toledohillel.org/uploads/1/3/1/3/131379639/ebe58d5.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/1/0435/7901/5331/files/gelekemufiraviverex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5391/6060/files/xulofelugegoni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9701/2890/files/leril.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1880/3605/files/63886590957.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sakumuxapiwitisozu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6536/0034/files/bisefozi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2857/6416/files/57379196415.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2762/6134/files/kodofonipofuwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4749/2506/files/76777885054.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tefukina.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63DA 4964 bytes
SHA-256: 8cee12045001dcfdd5d7b0dc9304824ca5842d2231ffacaad764a03e9f8396db
font_01_sfnt_off000074fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74FA 5532 bytes
SHA-256: 0fc3c3506ed4e32841c15c7edca3a609295b314edf232e0b2f9aee3143d977cc
font_02_sfnt_off000087a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87A1 10336 bytes
SHA-256: 526d01ff4147a2d4404f58f005f07d02d02cf45a6997553ab72e39a76315fd11

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