Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e6570c55f96a97…

MALICIOUS

PDF

43.8 KB Created: 2020-08-08 21:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b094a2223ad66d65594998c0c06effa SHA-1: 9c16ee5ce30b9a0bf43b51843d661b6c38dfb08b SHA-256: 03e6570c55f96a97894db14c36ab346fa39c55fbadfbcb3a3dec65c159c87ee7
162 Risk Score

Malware Insights

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

The PDF contains a link disguised as a syllabus download that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document also features a large number of external PDF links, suggesting a link farm for SEO manipulation or to obscure malicious destinations. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=cat+syllabus+2020+pdf+download
    • http://files.kaylaschmidt.com/uploads/1/3/0/7/130776826/lisigapiresa.pdf
    • http://files.villageofashleycountrychristmas.net/uploads/1/3/1/6/131637240/cef77f20.pdf
    • http://files.invictainstitute.com/uploads/1/3/0/9/130969204/riresaravow-kunorugabiwemu-dakajepixuwofon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0961/2712/files/medicare_dmerc_fee_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0430/0131/5491/files/60532505204.pdf
    • https://cdn.shopify.com/s/files/1/0429/4731/3827/files/luruwejoraruxovevetamajo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/siwadewoviw.pdf
    • https://cdn.shopify.com/s/files/1/0443/5791/0684/files/emacs_python_ide.pdf
    • https://cdn.shopify.com/s/files/1/0432/0280/5921/files/mejika.pdf
    • https://cdn.shopify.com/s/files/1/0430/8929/7568/files/aboriginal_map_of_western_australia.pdf
    • https://cdn.shopify.com/s/files/1/0437/1080/8216/files/kofetufejamebaripemidowol.pdf
    • https://cdn.shopify.com/s/files/1/0433/3692/5342/files/vehicle_lifting_points.pdf
    • https://cdn.shopify.com/s/files/1/0434/2261/3669/files/xukupenipazat.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_off00006c45.bin
bbe2f851e654a96a4c350d867e5f9702e187636a01fc6d4b4f0d19b14c0da415		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C45 5452 bytes
font_01_sfnt_off00007ef3.bin
a8e31e3fdd1b7c9f318f30b990de40b83be64a874e1417fc29859dc855c0936e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF3 10376 bytes

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