Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2998a9b9ba1009b…

MALICIOUS

PDF

42.3 KB Created: 2020-08-17 00:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0da3b949e2abf2b7b4f821346dfef36c SHA-1: c22711322ae061ff77e77c5d262f0cdc2d728f12 SHA-256: e2998a9b9ba1009bb7556225bb6e29ed72c0f79756357f011db6797bfdaf09f0
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including a critical link to a known malicious redirector at https://ttraff.com/pify?keyword=scholarship+letter+pdf. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to lure the user to this malicious site. The ML classifier strongly supports the malicious nature of this PDF.

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=scholarship+letter+pdf
    • http://files.johnharrisonsingersongwriter.com/uploads/1/3/0/8/130814644/xenatizu-vanore.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98559129476.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82191842179.pdf
    • https://cdn.shopify.com/s/files/1/0432/2089/3851/files/28247892613.pdf
    • https://cdn.shopify.com/s/files/1/0436/1987/7026/files/free_blog_template_html_responsive.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/59024557566.pdf
    • https://cdn.shopify.com/s/files/1/0440/6706/1910/files/management_griffin_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/5338/3833/files/84392684924.pdf
    • https://cdn.shopify.com/s/files/1/0449/0684/0231/files/maxifutixepim.pdf
    • https://cdn.shopify.com/s/files/1/0436/2308/8290/files/vowozipivonororobiregej.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_off0000668d.bin
4e4fd24ccc906237a321d47452fdc63d870e2ec7104d0e467ca5099d5e9b520c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x668D 5344 bytes
font_01_sfnt_off000078aa.bin
ca2727ed1bfcd456d0dcf4b9f0f9871aeb364e054963a88eca49a0fa6d7c15fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78AA 10528 bytes

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