Malicious PDF — malware analysis report

Static analysis result for SHA-256 623de5cb89763d3f…

MALICIOUS

PDF

43.3 KB Created: 2020-08-26 08:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6afec58230ef2add938fed53c04ded8e SHA-1: 38e40b8d2c15b5a2387e7c3931b3e5b839bb1add SHA-256: 623de5cb89763d3fa1b9185e7de207ac9c7f92e183abb4b7b88dd87977688966
162 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a download for 'corel draw gratis en espa ', which redirects to a known malicious infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates the PDF is part of a larger link farm, suggesting a spam or phishing campaign. The ML classifier strongly flagged this PDF as malicious, reinforcing the observed malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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/pify?keyword=descargar+corel+draw+gratis+en+espa%25C3%25B1
    • http://files.karynmehusstudio.com/uploads/1/3/1/3/131398356/ferorofedavo.pdf
    • http://files.elizaglyn.com/uploads/1/3/2/8/132814166/logetejir.pdf
    • http://files.stephenwarrenassociates.co.uk/uploads/1/3/0/9/130969695/301432.pdf
    • http://zisip.pulse-studios.co.uk/uploads/1/3/1/6/131606490/3472429.pdf
    • http://files.antiochmissionarybaptist.org/uploads/1/3/0/9/130969182/suvorimuvu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6232/1571/files/goxazonerabixekes.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/fadadikov.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/luturuwurikoza.pdf
    • https://cdn.shopify.com/s/files/1/0437/0310/7752/files/bajokagedimosabuluj.pdf
    • https://cdn.shopify.com/s/files/1/0433/4052/9816/files/weremipitedazejofagolaw.pdf
    • https://cdn.shopify.com/s/files/1/0439/1777/0920/files/rolisoxigunobuxejuj.pdf
    • https://cdn.shopify.com/s/files/1/0462/7916/4064/files/duxidunagefananijus.pdf
    • https://cdn.shopify.com/s/files/1/0436/3524/5216/files/geoffrey_local_anesthesia.pdf
    • https://cdn.shopify.com/s/files/1/0432/8528/2980/files/90127234674.pdf
    • https://cdn.shopify.com/s/files/1/0428/1637/2892/files/woxirutapozumiviwufo.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_off00005e13.bin
e3d65d053fc301e5f717a7b957526c0316ba4603038109e07c8fb45c03a71c4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E13 5544 bytes
font_01_sfnt_off000070c7.bin
9c64417561c719aa922cf8c355c367e77d4c8981868d09d951fd1fe88acaf164		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70C7 14496 bytes

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