Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce457c78e828f2a…

MALICIOUS

PDF

43.5 KB Created: 2020-08-08 18:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebbda3fd0c3c8bcf7deab453da8d572b SHA-1: 7e29a27ace62f278105b8e4980dc936a000edbd9 SHA-256: 4ce457c78e828f2a279e626d28f5ee748a591c22995532dc9f2e17e7612043b3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm behavior, with numerous links to external PDFs hosted on various domains, including Shopify. The ML classifier strongly supports the malicious nature of this PDF. The primary malicious IOC is the redirector URL, which likely serves as the initial stage for delivering further malicious content.

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=by+products+of+wheat+pdf
    • http://files.ashleyerina.com/uploads/1/3/2/6/132681443/jirisalisudopo_rurawar.pdf
    • http://files.keitastudio.com/uploads/1/3/1/6/131636946/c06a693aa446a7.pdf
    • http://files.hiohia.org/uploads/1/3/2/7/132710797/cd38e6d37690c.pdf
    • http://files.nicolasandysmillinery.com/uploads/1/3/2/6/132681356/65e3c8d3626a4d.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/39744943813.pdf
    • https://cdn.shopify.com/s/files/1/0434/4555/1271/files/volusozunerevegovuxexufu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fakuwonilojovaxibudebu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84113106953.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/bunonugoxagotutan.pdf
    • https://cdn.shopify.com/s/files/1/0438/3778/4224/files/amoral_definition.pdf
    • https://cdn.shopify.com/s/files/1/0431/2009/9488/files/l_amplificateur_oprationnel_cours.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/87290508700.pdf
    • https://cdn.shopify.com/s/files/1/0429/1792/0934/files/59666533917.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6157/files/tebeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/7387/1767/files/jetozulukixukuxova.pdf
    • https://cdn.shopify.com/s/files/1/0431/2023/0564/files/xubapurunezabifujinune.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/16171064830.pdf
    • https://cdn.shopify.com/s/files/1/0434/1907/4722/files/generalidades_de_las_bacterias.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c25.bin
8fef53732e2a50bc8b00effd772aaca02c6be45e884fb6c16750c3f4687043f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C25 5456 bytes
font_01_sfnt_off00007ed1.bin
550391be4a22ce0d97a79675f76c6197383acd6af68f73af875629c0a66c0475		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED1 10104 bytes

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