Malicious PDF — malware analysis report

Static analysis result for SHA-256 733aebaccc76b78d…

MALICIOUS

PDF

49.9 KB Created: 2020-07-09 01:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 267e200b293e452efc9b8e050828190c SHA-1: 142c23a5ee181abccd3c496a69e96d7344ebb7bb SHA-256: 733aebaccc76b78d9362a0e8877b388b5feb493b054854986bbf36025af33836
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by an ML classifier as malicious and contains numerous links to external PDF files hosted on various domains, indicating a link farm. One of the primary links redirects through 'ttraff.cc', a known malicious redirector, to a lure about 'show pdf thumbnails in windows 10'. The document's structure and the presence of multiple external links suggest an attempt to lead the user to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/wb?keyword=show%20pdf%20thumbnails%20in%20windows%2010
    • http://files.surrenderedtochrist.org/uploads/1/3/2/6/132681656/wulegi.pdf
    • http://files.willowwildedges.com/uploads/1/3/1/8/131856443/xukopiwome-tojazelapiz-kasivezobisu-sunezurawuse.pdf
    • http://files.thegirlsfromguantanamo.com/uploads/1/3/2/6/132681938/2217839fd6588e.pdf
    • http://files.tales-from-the-woods.com/uploads/1/3/0/8/130874175/c410af3d654.pdf
    • http://files.williamstreetcoc.com/uploads/1/3/0/9/130969485/wipegu-mibuv-jukumiginir.pdf
    • http://files.frankvanbogaert.com/uploads/1/3/1/0/131070378/zugowulibatafus.pdf
    • http://files.pemmensgolf.net/uploads/1/3/1/3/131379612/febokibilodirina.pdf
    • http://files.nxtgenerationenergy.com/uploads/1/3/2/7/132740415/sodegebu.pdf
    • http://files.wildfaithwellness.com/uploads/1/3/0/7/130775846/duwafovab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://riduwifoviw.files.wordpress.com/2020/07/ruloxipewoxego.pdf
    • https://kimetaduwun.files.wordpress.com/2020/06/wiketijixozakipaket.pdf
    • https://tokejar.files.wordpress.com/2020/06/88803193463.pdf
    • https://fafuromap.files.wordpress.com/2020/06/48050320813.pdf
    • https://tamitiliredu.files.wordpress.com/2020/07/61911357354.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977314479.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/buxidumex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32732230761.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65587220918.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gowavofopinesifaremoka.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zekimopesafirizaxos.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_off000084a4.bin
b83f7686ae73099bbb395b799adc19d5246b9eceeb790609882f57b50d4ef7e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84A4 5480 bytes
font_01_sfnt_off0000972b.bin
0bab5db8403fd6b32ae3c799f9482b7ed36c01d2ecc745351e22f5a047ecf684		 pdf-font-stream PDF embedded font (sfnt) at offset 0x972B 10280 bytes

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