Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f404337cc0914e…

MALICIOUS

PDF

72.2 KB Created: 2020-10-07 00:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 38a78cfa2ab618fdede1adfc1af2a922 SHA-1: 65a477f04e9b05f541c4bc81b7b58a60b7c7e15e SHA-256: 83f404337cc0914eda7e676a13e887a7124b1becceb5f05f870120e30f49ab96
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://gettraff.ru/pify?keyword=pittsburgh+civic+arena+roof+open In PDF document text
    • http://files.animalmedicalcleveland.com/uploads/1/3/0/8/130814515/07c45.pdfIn PDF document text
    • http://mujimil.oldepearprimitives.com/uploads/1/3/0/8/130814674/5930343.pdfIn PDF document text
    • http://files.ashtynnewbold.com/uploads/1/3/0/7/130775640/kudamatogomoxo.pdfIn PDF document text
    • http://files.dartendistrict.com/uploads/1/3/1/8/131856381/jarukid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/84e817c4-a53a-4327-8bf8-6d3f9475c237/52687850305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8ac847-0f3a-48e5-be56-2197d14e1e1f/2074110053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa53d80c-6f9a-40be-970b-9ed3deaf40be/jorugekadawilarogoloper.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4068/8296/files/61824849310.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4132/3170/files/gobojejidivirofuvano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3702/3641/files/87651793280.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8515/9843/files/96802264748.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9735/0554/files/73068038142.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7751/5941/files/tekupekivesimi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8154/6390/files/mva_online_test_not_timed.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_off0000ce58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE58 5328 bytes
SHA-256: f56c6185efd2ac925e13094532aacc58ea4bbd4f87778f8073b62644c5e6e3aa
font_01_sfnt_off0000e06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06E 10836 bytes
SHA-256: 963ae65e15720aa174cf0eb456da7dac1d952c86d10850ded122ff469a0309b0
font_02_sfnt_off00010599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10599 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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