Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39d0ff5c9630c1a…

MALICIOUS

PDF

50.1 KB Created: 2020-10-05 19:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 2f3013cdf47e4aeb05e427d0a1da2f2d SHA-1: ef49c7eb7daf6505f036265bca1a49cc099d3c43 SHA-256: b39d0ff5c9630c1ac1283e935a2493964671224b15e71b9fbd80b0c73002e9f7
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/strik?keyword=settling+time+first+order+system In PDF document text
    • http://files.kathyfriend.com/uploads/1/3/2/7/132741382/cb4f6a.pdfIn PDF document text
    • http://files.andrephotography.net/uploads/1/3/1/4/131438188/1516099.pdfIn PDF document text
    • http://maguw.mysticmancreations.com/uploads/1/3/2/6/132680981/pipupidinamolaw.pdfIn PDF document text
    • http://files.holtonhomeplace.com/uploads/1/3/1/0/131071262/nolaninapal.pdfIn PDF document text
    • http://todina.bethelchapelny.org/uploads/1/3/1/0/131070588/4608730.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/1/0485/0076/8930/files/blancanieves_y_el_cazador_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9127/8486/files/zozuxowowudezalej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5004/4069/files/6.8_kg_vs_lbs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2358/7736/files/side_by_side_student_book_3_third_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/811f0edd-3edf-4eaa-8afc-08a1abda5cbe/57748489172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b3767e2-49b3-4957-a1a0-5b867fe4f4a8/26520416910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1085c6ba-5d3b-47a0-b91b-c3c4a59e6c8e/modorebanideg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15950800-12a5-4d08-b3bb-4fc11b8c86c2/14557972482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7a39e97-4a88-4453-b50f-8d975ed533ec/wubinexixulodobojafeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1767250-1417-4a64-b52c-abe2432a9bee/65445018016.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6525 5224 bytes
SHA-256: 7f54cb80799b5143621d968c4633397a86cc979b1d806398cb7baae8ff35f886
font_01_sfnt_off000076dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76DD 15304 bytes
SHA-256: 093cf30ade1306018acebc06963c54d916af7133d2a87bcef2a9b2f71283bcd3
font_02_sfnt_off0000a6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6A5 16112 bytes
SHA-256: 9e03e6e22369c08031692eeb7e3ff23a9a33c112d12160bfd6a6040e76add6a5

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