Malicious PDF — malware analysis report

Static analysis result for SHA-256 411a7599ea1124c8…

MALICIOUS

PDF

68.0 KB Created: 2020-10-17 16:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 69218ec6a385a3749fb40d9ca183c07d SHA-1: 8be5e0ac3d6df083c94c4fa626ac2edbef012623 SHA-256: 411a7599ea1124c84750c7d6de322a8392096ee6a91c0170a5571d0430528a77
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9854

Heuristics 6

  • 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.
  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • 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/123?keyword=oster+clipper+golden+a5+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368249/normal_5f897d1659b20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f87300a8aa24.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d48ad4c-5837-4754-b6e5-a4d8f9933a3e/daxixikitivuboro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb5c4a50-6613-489e-a6c7-2430732bfdb5/69823914427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2479ff0f-2a80-4d0f-852f-84f60622ef85/28397142520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c564425-8cca-47ac-be57-17e256fd263c/nesufefopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61015352-2078-4f0e-a9c6-416ca96124f6/kiselusokod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4492/8674/files/hui.edu.vn_lich_thi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0778/1281/files/rv_ceiling_fan_parts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/0900/3687/files/96159718933.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0715/8690/files/82940288495.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2600/1315/files/bareguripononagik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7638/6457/files/city_designer_geometry_project_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6093/1991/files/32545943577.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7859/7790/files/word_problems_for_grade_3_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1568/4263/files/zixunuxijizekegexuxujima.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9503/4529/files/bad_intentions_lyrics_digital_daggers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d34be5b-d7e9-4cc9-9960-8a4cd107639f/sanegoxizefebej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7480fb48-32af-400a-b372-6ccd1522b184/moseperufop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17b81c44-43ec-496e-88e7-7b62653141bd/senokogejor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/577b1081-d12b-4a5b-aae7-71d21200f14b/muzokofopegonodof.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_off000050c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50C1 5544 bytes
SHA-256: 5e042e50c37bf5c0096c73112527006fc2b46b716754b40320c3767e119015fe
font_02_sfnt_off0000e09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 9828 bytes
SHA-256: 9d2546334cd89eee56641ec1422f54a935b8dee9bb75845b428809607f30cbd2
polyglot_child_pdf_off00007d20.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x7D20 37607 bytes
SHA-256: ed89f1dd882a899f85e20aca789c82516193780c7aa1588fb3cde8f202bf0a36