Malicious PDF — malware analysis report

Static analysis result for SHA-256 1320ac55bf4194a5…

MALICIOUS

PDF

37.8 KB Created: 2020-08-28 21:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d83acaf917364d38ac0bf267cbd3ca3 SHA-1: fb3cf73f5f01c4ebc9afa54a9e115e1690db8af6 SHA-256: 1320ac55bf4194a5ecc077176bd016baff5b2289d09023d1f009f3dc98d1c222
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to a link farm designed to improve search engine rankings. One of the primary links directs to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the PDF structure and embedded links suggest an attempt to redirect users to 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.cc/wix?keyword=el+nuevo+houdini+book+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_5b0760ebcf8242cf9a594d4b66f2709a.pdf
    • https://static.usrfiles.com/ugd/b8c837_1074e07e95a047e0bbf8a828a259661f.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f3231aef4ee41f991438e683adcb6bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8c3f96b8e13470b834a4425a36cae95.pdf
    • https://static.usrfiles.com/ugd/b8c837_e77ac6e23bbe420dbf74ac012ce76e96.pdf
    • https://static.usrfiles.com/ugd/b8c837_09866f46679549229b369d8bef85c2c7.pdf
    • https://static.usrfiles.com/ugd/b8c837_e687bd6877354514be288505e5b4670b.pdf
    • https://static.usrfiles.com/ugd/b8c837_891e1e417a1c4325ab2beba557355967.pdf
    • https://cdn.shopify.com/s/files/1/0432/5507/0880/files/saitek_x55_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0434/7861/4168/files/fuferatitizijitogofulazi.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_off00005664.bin
02d7bcc8356d42aa7b1616bd03f27c9c5ee464d664eefffeb2414f2a3fba1a73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5664 4868 bytes
font_01_sfnt_off000066f5.bin
33829b1a0eee2ea3cb69dd9f6af62cb6c8afdd22b802ea19dc99a73858e87e4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F5 10308 bytes

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