Malicious PDF — malware analysis report

Static analysis result for SHA-256 b113d65e52aa4160…

MALICIOUS

PDF

49.7 KB Created: 2020-11-05 05:19:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2aaa775fbf5fb0667f505197df1b71e5 SHA-1: 82e881427be5589de1f6d279dc4dd9a3d7a38209 SHA-256: b113d65e52aa41605c2408c59ba132a67e544b38ed6249c479ad66c1138ed8fd
134 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically `https://ttraff.ru/123?keyword=tupperware+yellow+measuring+cups+lead`. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure the user into clicking it. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ttraff.ru/123?keyword=tupperware+yellow+measuring+cups+lead In PDF document text
    • https://fobedixosofano.weebly.com/uploads/1/3/4/3/134377241/861039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_5fa33618bd935.pdfIn PDF document text
    • https://jawogebewo.weebly.com/uploads/1/3/4/3/134369376/leresidorez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377410/normal_5f8c769a19834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385230/normal_5f9edf19c6da8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_5f90a8d24baac.pdfIn PDF document text
    • https://kezobonuduwu.weebly.com/uploads/1/3/4/4/134457579/3c0c85b1c95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5f89214641a58.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/xabalaru/xavagenurij.pdfIn PDF document text
    • https://s3.amazonaws.com/sezutuma/42714444701.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/51448318321.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/zaburzenia_psychiczne_rodzaje.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_off000081a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81A4 5536 bytes
SHA-256: f8523e96293b7226ce4d496b62c38f553307ddaebb5f27199a12e066026594ae
font_01_sfnt_off0000947e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x947E 10936 bytes
SHA-256: 86d1c207ffffb9956d76eecbb46589291604318f00bdbd27c891895facd29141