Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6cd02396e02088…

MALICIOUS

PDF

41.0 KB Created: 2020-11-09 09:05:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 76c3851261f01394f0f4457b5d1ba8aa SHA-1: d5063e039dd25786859eb6b2c42f719aef3228c7 SHA-256: aa6cd02396e020881febb555cb3f20c422a26765b2018a9e2b9ceac44bd13a60
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/123?keyword=samsung+smart+tv+remote+apps+store PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407983/normal_5f9f723b237d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369933/normal_5f8daf03528c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410194/normal_5fa1abf07400f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_5fa4b7709ba1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5f8741fb5e8aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5fa4ab993d050.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/xazarujokemus/crest_middle_school_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3cbca4a-eba0-414a-bd54-ed33e41a5dd3/ketaxat.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/40310966855.pdfIn PDF document text
    • https://xanafegeze.files.wordpress.com/2020/11/rajozajilozaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/tawunap.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/48514604800.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_off00005f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7F 5268 bytes
SHA-256: 401f3c77b1c19a79580f5a9767a26bce7b9d67f3993eeb807161c214e27575d0
font_01_sfnt_off0000715b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x715B 11476 bytes
SHA-256: 1a1a55af0bd5df869a31abdf31708a7946cda32d3c3161f71305e3911b0c3b96