Malicious PDF — malware analysis report

Static analysis result for SHA-256 630936969bfa12a8…

MALICIOUS

PDF

53.6 KB Created: 2020-09-19 02:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6a1fdeb865bfeafa60490cdb174e869 SHA-1: ad6d652f9c263deb6d8ca40cab79ab86a1e51e33 SHA-256: 630936969bfa12a8d7793d5f475e48a089dcc887fd9b74b322e4af8e5a345fea
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is designed to lead users to further malicious content. The document body, though heavily obfuscated, contains the same malicious URL and numerous other URLs pointing to PDF files, suggesting a link farm or downloader infrastructure. The ML classifier also strongly indicated maliciousness.

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.club/wix?keyword=ryujin+jakka+meaning
    • http://zegeru.gktfreechurch.com/uploads/1/3/1/6/131637881/6761200.pdf
    • http://files.theriverrunsthroughus.uk/uploads/1/3/1/4/131437676/mexused.pdf
    • http://files.dhi-nc.com/uploads/1/3/2/7/132712306/c2ba1c74fb2d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6428/5601/files/80666781801.pdf
    • https://cdn.shopify.com/s/files/1/0434/5308/7911/files/xadobeduruxojalevijupozop.pdf
    • https://cdn.shopify.com/s/files/1/0457/6886/8006/files/d-_day_self_guided_tour.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5622/files/batho_pele_principles_in_education.pdf
    • https://cdn.shopify.com/s/files/1/0433/7090/5756/files/gaval.pdf
    • https://cdn.shopify.com/s/files/1/0431/6961/1935/files/gunonutetazorop.pdf
    • https://128a2ce8-92e6-4e0c-9367-b4427dfe68f3.filesusr.com/ugd/18122d_978148d612c549dfbb1eb955f9be544c.pdf?index=true
    • https://60349cf0-8a25-46ee-b000-1b8746ef79d3.filesusr.com/ugd/3b47cb_9ea5946a868c437baffe6bf3c5f523ff.pdf?index=true
    • https://9bf99913-82a4-4f79-8b3d-b156f47ac23a.filesusr.com/ugd/3f0e57_c14e24cd34344fd18f6b81837dfba188.pdf?index=true
    • https://c0957f98-6233-4d1f-a7dd-473f2ea2b733.filesusr.com/ugd/f7fbc8_8965e7f7264b4af58dc56bf2b0f45af8.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065e3.bin
4d27045bcbec3205ebc3804bdb05a1f053cfca0ae20718f08374cf09333f272e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E3 12800 bytes
font_01_sfnt_off00008fb9.bin
a0e4a4142bcf2fd84f062dc3a0e149d8b66ee45c30ef10ad0226c1de41310f18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB9 4948 bytes
font_02_sfnt_off0000a0a1.bin
9906959f64bd23d93034fe5aeb60f9e8f451d5ec46c878ea59710b2cd4752a0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0A1 15048 bytes

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