Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35082428c1e9d26…

MALICIOUS

PDF

45.8 KB Created: 2020-10-14 19:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 35d0d2becbb7349eb16cfd949f0736dc SHA-1: b7ea5ab50664c92b3ee08768718c774c0bbd6ca4 SHA-256: f35082428c1e9d26082e47fd048fa2ec3e6ad5ca6a8706f23a589e3c4dc37c5f
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=antenas+de+telecomunica%25C3%25A7%25C3%25B5es+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5f87214fd797c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_5f871bd46148e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5f8717f217365.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/vunidixeviro_xitosujitupile_kadape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f871265b9859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f86f5a75eed7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_5f87007cd54c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f86f55e02229.pdfIn PDF document text
    • https://site-1039570.mozfiles.com/files/1039570/pabetufux.pdfIn PDF document text
    • https://site-1040256.mozfiles.com/files/1040256/86085621605.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/ff45b608-1cc5-4271-a63b-efd7bb52e676/sudiroromumoxofuza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8e8f9a4-d432-441f-8831-361d8447e3a1/34167456487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99791a40-1dbc-4cef-ae8e-e1f87c0ecf44/41697371678.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8456/9494/files/zexesafuxuxuged.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7872/5021/files/zeroketuwozu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7970/3997/files/77606664090.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_off00006fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC4 5596 bytes
SHA-256: c45114a83881379c78ba0c68a3f4d635bb4072ec806c73a9707f6ffb2f6ae849
font_01_sfnt_off0000822f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x822F 12668 bytes
SHA-256: 677cc1902561f482ec296b7aff9cff64a0b8ac593677ee2456741b669c7559a7