Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50fa259fadc21a3…

MALICIOUS

PDF

57.9 KB Created: 2020-12-19 13:56:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: aa95b665b4b5b54d220c17e333d2c32a SHA-1: 51b74d6cb276cdab44c02707cde7d2264dd5253f SHA-256: d50fa259fadc21a30413fa22582464074518868ff7897327d5dd8e5054386893
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating it is a malicious redirector and link farm, specifically pointing to 'traffine.ru' as a malicious redirector. The embedded URLs and the nature of the heuristics suggest an attempt to phish users or distribute further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/strik?utm_term=iglesia+pentecostal+unida+hispana+inc In PDF document text
    • https://vekerarefatada.weebly.com/uploads/1/3/4/8/134868636/ef5bf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388835/normal_5fc2450ea68cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/66928351187.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/boletin_informativo_ejemplo.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/75422791220.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/hailea_chiller_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/72355792884.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2c1e18ef7301f8b1ccf77/t/5fcd2e5b33187724c4fb400c/1607282267807/wukubex.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/39646320495.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3797e5e8e827d429e31b4/t/5fc60f633c02f22b9ddc2d76/1606815588792/randolph_mn_directions.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_off0000a663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA663 5176 bytes
SHA-256: dd49e32463015f62366ba410e62eb849c882865217ec1959c7d6a0013c911d61
font_01_sfnt_off0000b800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB800 10572 bytes
SHA-256: 295bb5f766085ae18d5c013bd1b11f99fe5d91753dbb59007d64d7517ab2401f