Malicious PDF — malware analysis report

Static analysis result for SHA-256 327ff89415343049…

MALICIOUS

PDF

56.0 KB Created: 2020-10-08 17:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9a32156292ee4b42fff6d85dbefbc05b SHA-1: f88cee4c958580a048cbd76a2ba6b7c49930d264 SHA-256: 327ff89415343049037deef352bce729da0351d8ba3d971c20e038e024b08276
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious due to its extensive use of embedded links, many of which point to known redirector infrastructure or disposable hosting. The document body contains text that appears to be obfuscated or corrupted, but the presence of the URL 'https://ggtraff.ru/strik?keyword=rsl+felgen+gutachten' strongly suggests a malicious redirection attempt, likely for SEO poisoning or phishing. The ML classifier also provided a very high confidence score for maliciousness.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=rsl+felgen+gutachten In PDF document text
    • http://xowip.stmarybourne.co.uk/uploads/1/3/1/0/131069891/fabede-vozerefuwakanub-ruzala-paboboxopa.pdfIn PDF document text
    • http://files.orangepc.org/uploads/1/3/1/8/131871772/gajipifen.pdfIn PDF document text
    • http://files.wiganhandyman.co.uk/uploads/1/3/1/0/131070611/wugepemiv-sidurev.pdfIn PDF document text
    • http://files.spacefab.us/uploads/1/3/2/8/132815359/wezanoga.pdfIn PDF document text
    • https://site-1036728.mozfiles.com/files/1036728/vopab.pdfIn PDF document text
    • https://site-1036649.mozfiles.com/files/1036649/36379772468.pdfIn PDF document text
    • https://site-1039413.mozfiles.com/files/1039413/fegujeg.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/66a7b5d8-0868-4acf-842b-0a453e3e2296/xixawofurivujubasiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0642b8d0-1d35-45b3-afc8-4d3504891bef/valimane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f71764fa-8caf-46e1-b3a6-4c8c0b2e655b/73880243667.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/9905/8073/files/68709270945.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3517/1736/files/summary_leadership_and_self_deception.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/0941/2761/files/rujeresolopumulas.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_off000090b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90B4 5052 bytes
SHA-256: 9d97ff39db1fae7abcd4538dc3baa930cddceccf00e902f7a28eb60372772b78
font_01_sfnt_off0000a1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1F1 15624 bytes
SHA-256: 5a9c9a69d9f15b8d3c2a9dee5f2c9097f5316ce91bd36b9f81db4b0eacce8a13

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