Malicious PDF — malware analysis report

Static analysis result for SHA-256 18dbe581408f1ccb…

MALICIOUS

PDF

47.4 KB Created: 2020-08-19 06:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e76d372d77a1336bc6f91576864aae1 SHA-1: ca2bac8fbd7977121fc9a37514f541250164cbce SHA-256: 18dbe581408f1ccb93a2811c6938cf949acf80b09c85f72dc7eeb74b6cba2e1b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. While no scripts were extracted, the embedded links are the primary indicators of malicious activity.

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.com/pify?keyword=formation+chaudronnier+soudeur
    • http://files.johnbeswickfurniture.net/uploads/1/3/1/8/131860204/demijola_gupiletubavofi_debigun.pdf
    • http://files.bohemianattic.com/uploads/1/3/1/0/131070618/zixopi_kodovajofogexew.pdf
    • http://files.bellacalore.com/uploads/1/3/0/7/130775396/dofapijikasetake.pdf
    • http://kuwitaxap.makingscentsofsoy.com/uploads/1/3/2/8/132814718/xedug.pdf
    • http://fibako.christinawei.com/uploads/1/3/0/7/130775511/xaxire.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0278/0057/files/zoxakafam.pdf
    • https://cdn.shopify.com/s/files/1/0431/3622/1341/files/wupulixosiro.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3701/files/wivemaged.pdf
    • https://cdn.shopify.com/s/files/1/0452/6401/1421/files/bernie_madoff_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/2149/1621/files/57789064140.pdf
    • https://cdn.shopify.com/s/files/1/0430/9372/1255/files/sumepapig.pdf
    • https://cdn.shopify.com/s/files/1/0432/5743/0176/files/extraccion_de_aceite_por_arrastre_de_vapor.pdf
    • https://cdn.shopify.com/s/files/1/0450/3640/4900/files/86583960022.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/44929456585.pdf
    • https://cdn.shopify.com/s/files/1/0435/2265/4362/files/doxizaxiwuvag.pdf
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/pulozesivo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/pnrc_2018_date_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/7845/1351/files/siwogijaxenokezasajis.pdf
    • https://cdn.shopify.com/s/files/1/0432/6077/2515/files/mipudeliz.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_off000079b8.bin
03b8977d25e608eaf26df11960963bfb8c6b2b88bc92a1973a60c3b45880ddf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B8 5100 bytes
font_01_sfnt_off00008ad6.bin
777495a2b27c1e3d16038cdc90832f388a88aadcad80a31988832507da57e002		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD6 11464 bytes

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