Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b996151c04a315…

MALICIOUS

PDF

37.1 KB Created: 2020-11-06 22:21:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 318edc312412e8f9155482563974ea4f SHA-1: 2ef9b2ba9fc32260e018c6693519c87b5d254d5c SHA-256: b7b996151c04a315e02ffa0af5d22d3370bef7c5e927502c0d86acbc5557c21f
76 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is malicious and uses an image lure to redirect users to an external URL. The embedded URL `https://trafffe.ru/aws?keyword=mobigo+2+logo` is identified as a redirector, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafffe.ru/aws?keyword=mobigo+2+logo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370317/normal_5f92145d4dd74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_5f94eb54dca94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f87572527f35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_5f95c34a458b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f86f66835f24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_5f8e55cdaf880.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://silisejez.files.wordpress.com/2020/11/xuvepefariwujowo.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/related_constrained_diversification_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/defensa_nacional_definicion.pdfIn PDF document text
    • https://tafexoru.files.wordpress.com/2020/11/3294531957.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/riwawapizepadipox.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_off00005577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5577 4648 bytes
SHA-256: 219984a47b50180a188eb554e52c34d1aa0d6bfe1c214cdce58ac5c39a4b4212
font_01_sfnt_off00006575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6575 10188 bytes
SHA-256: 29a0d259a3ec8cf760ef5f9228150bb03fbd901100c375d0bea5e04cedd1382a