Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ecc9574c593814…

MALICIOUS

PDF

34.4 KB Created: 2020-10-04 04:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 6aa59e8f540c699897a197b2554cc7b6 SHA-1: 27adddc04eaefe9c88d98984b2804910431403de SHA-256: 31ecc9574c5938142c1c771d3aabb3e1fd4433e18289beaa5d50b64f86b53c97
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://ggtraff.ru/strik?keyword=cuadrado+de+pearson In PDF document text
    • http://files.shannonrosemoriarty.com/uploads/1/3/2/6/132682668/3370950.pdfIn PDF document text
    • http://files.orianadierinck.be/uploads/1/3/1/3/131379099/jurovaka.pdfIn PDF document text
    • http://files.waterislifebeads.com/uploads/1/3/2/7/132740204/xumabi.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/bbac305f-d117-44d3-8533-c86631042a4e/75502518690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/334c8736-0bf3-40a0-882a-c248f4f9b19a/59843286514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6524acd-1da5-4755-87c7-b1d6c14c2004/kinarobirebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29cf7678-0797-4492-ae49-db32402c7bd1/78525887590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1d182a8-4814-4b32-a517-14934450cc6c/73413921695.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0475/8994/9596/files/jormungand_season_2_episode_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/benadefamuna.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9816/8725/files/13102600333.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6703/1200/files/fukabuni.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_off000047af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47AF 4828 bytes
SHA-256: 1e527461f7d4a37a97b6b86422d8139e6e4c2ce7dc43532cca97c00c5fd9b4d8
font_01_sfnt_off0000581e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x581E 11036 bytes
SHA-256: eb261c087f0d2a1d5f91e5b281a6d649e0f19d315dc67e783b8862cd6096f1df