Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a59cb5b8e9cef89…

MALICIOUS

PDF

43.7 KB Created: 2020-07-09 21:39:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0b11a8bf66b5820a37edce3dde84891 SHA-1: fe643dff2b07bec228fd2f87c9589af994a16cd8 SHA-256: 5a59cb5b8e9cef8907da85333b7f30c85987a32537fbe27c9bb38ee52c5abd32
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that is likely used to redirect the user to malicious content, potentially for phishing or malware distribution.

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.cc/wb?keyword=tipos%20de%20soldadura%20mig%20pdf
    • http://files.grovebaptist.org/uploads/1/3/2/6/132696621/1738460.pdf
    • http://files.barriointellect.com/uploads/1/3/2/7/132740321/104c7d.pdf
    • http://files.therosebineclinic.co.uk/uploads/1/3/0/8/130874325/df9c8.pdf
    • http://files.eshelartphotography.com/uploads/1/3/1/4/131453036/2571583.pdf
    • http://files.coloradopricklypawshedgehogs.com/uploads/1/3/1/4/131437832/notusokanufizoj_kedek_nusad.pdf
    • http://files.hawaiicreativemedia.org/uploads/1/3/0/8/130874582/a95f036bbd.pdf
    • http://files.churchintheloop.com/uploads/1/3/0/8/130813546/6646078.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://tinuzedujat.files.wordpress.com/2020/06/95497106487.pdf
    • https://pumogak.files.wordpress.com/2020/06/38313040065.pdf
    • https://tuxipulewuwa327267172.files.wordpress.com/2020/07/nidigevadifepisas.pdf
    • https://polosewus.files.wordpress.com/2020/06/27450520298.pdf
    • https://kamaveboziw.files.wordpress.com/2020/06/40855542008.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuketunaxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/paxotaxazojulilinitulo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sazofafusogowo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jufozigazagapuji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61086590007.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jokesinoximirupabujikupoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98559129476.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_off00006d1b.bin
a875f1f40f7921a4584bdc9764d79edc9e57191142e57bf8bc8afad4ee9716a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1B 5008 bytes
font_01_sfnt_off00007e1e.bin
617ba9e963ccaff79567b96e4a55e16c8e59710eafc8dbc0ed1d4f11454e78dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E1E 10912 bytes

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