Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13c3ccca8d26e84…

MALICIOUS

PDF

47.1 KB Created: 2020-10-12 03:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 6488c6ea2f531bcb6da4bd38c09a959f SHA-1: a69a07dbdcc3dbdfcfab489b3178a1ebc634c064 SHA-256: c13c3ccca8d26e840e6739b7fe8369835cf543527380090737fac9736a4fffbb
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=tu%2525C4%25259F%2525C3%2525A7e+%2525C4%2525B1%2525C5%25259F%2525C4%2525B1nsu+ol+der+olur In PDF document text
    • http://files.struckndesign.com/uploads/1/3/0/8/130874533/xukabobel_ropeselodezu_limijuz.pdfIn PDF document text
    • http://files.paysagedegrand-pre.ca/uploads/1/3/1/3/131381464/d6e984e6b.pdfIn PDF document text
    • http://fubudep.wotta.co.uk/uploads/1/3/0/8/130874038/1bee1a90e4c5.pdfIn PDF document text
    • http://wugul.lizwhalendesign.com/uploads/1/3/2/6/132683078/kalibunotuzog-widakipit-xepup-zejiralapub.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/1/0429/8440/7199/files/depression_out_of_the_shadows_quizlet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5407/8871/files/3560141051.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1777/0920/files/school_counselor_personal_mission_statement_examples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8385/2695/files/star_spawn_mangler_5e.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1274/3580/files/jersey_city_public_schools_calendar_2016-2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/167b4560-81cc-42a1-96b2-7a4955ecf684/42941028035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5afc0bd1-3c9d-4030-b52d-3d77ee4fd000/piwegafax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/931e583c-f9e6-4a5b-9b0b-5eb75c7fc784/17522737891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e8f1510-98e9-4eb5-b4c0-bbc982ff31f0/luvirukemug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8b73f5d-0289-499c-83f9-8d759aab493d/rezupetedatidojowu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/5485/8908/files/xudomoxuzes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1751/8751/files/doxodigikopaxumutenigi.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_off0000777a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x777A 5252 bytes
SHA-256: 901c7f78de4836ee89059e85d075a8598422456372ed1481cbd29d54a9e8dbc7
font_01_sfnt_off000088b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88B8 11500 bytes
SHA-256: b98d8685cc2b8d9bce290205aa9bbf64d312227ae51e284d1225c66a058118cf

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