Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eb47c1bbfac0c5b…

MALICIOUS

PDF

43.1 KB Created: 2020-08-04 23:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e57a8df1b50e389f701943bceada91ba SHA-1: f0348ccc2fc475e8eca9a706b76891f98cf5244d SHA-256: 0eb47c1bbfac0c5bd7dd394f78262fe22b6c66352a12f23f0d227a218e5f2f7d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify-hosted PDFs, which is indicative of a link farm or SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=bachianas+brasileiras+n+5+pdf'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure suggests an attempt to drive traffic to potentially malicious or SEO-abused URLs.

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.
  • 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.
  • 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/pify?keyword=bachianas+brasileiras+n+5+pdf
    • http://files.nationalsculptorsguild.com/uploads/1/3/0/8/130813550/falurunegeko-rumulalumos-noxode-sifodupudomuvo.pdf
    • http://files.mainstreetenid.org/uploads/1/3/2/6/132681144/diwezenuxi_xoguduvuragapok_pibabu_jiteb.pdf
    • http://ratakapef.developinganaesthesia.org/uploads/1/3/0/7/130775448/fuzaluzatigo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/4094/5829/files/gemub.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jidaxuno.pdf
    • https://cdn.shopify.com/s/files/1/0433/5026/1915/files/gary_valenciano_songs.pdf
    • https://cdn.shopify.com/s/files/1/0432/2630/0575/files/92143805556.pdf
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/stardew_artisan_or_agriculturist.pdf
    • https://cdn.shopify.com/s/files/1/0430/0944/1953/files/15231937623.pdf
    • https://cdn.shopify.com/s/files/1/0429/4069/4684/files/ruby_binary_search.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3334/files/gurafiwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/9048/5150/files/19327145519.pdf
    • https://cdn.shopify.com/s/files/1/0432/9878/3382/files/76570447057.pdf
    • https://cdn.shopify.com/s/files/1/0440/5493/7765/files/raninekori.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2017/files/67687206325.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rapuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/advanced_language_practice_michael_vince_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068f0.bin
cf6a297930b0300bbc8cd6e8c6eaf260e56131b01cd4134a1a4df0fc187d0eb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68F0 5556 bytes
font_01_sfnt_off00007bcb.bin
98f6d3f43ff49df269f68c359c3dc540830d9da934c45398129eeb0bc0ca50cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BCB 10664 bytes

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