Malicious PDF — malware analysis report

Static analysis result for SHA-256 67860f25fd9d5ec4…

MALICIOUS

PDF

43.0 KB Created: 2020-08-22 15:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 610a46c5217f8754ce447942a603972f SHA-1: 1be6c9dd53e11eb377c13412203fdc433b6a7d37 SHA-256: 67860f25fd9d5ec4b181d6dd903772e62595db0d2dda17f657efe8960a846b85
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm of numerous PDF files, masquerading as cosplay guides, which redirects to malicious infrastructure. The primary malicious URL identified is ttraff.ru, which is flagged as a known redirector. The ML classifier strongly indicates maliciousness, supporting the heuristic findings.

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.ru/pify?keyword=boba+fett+cosplay+guide
    • http://files.iancurtisarchitecture.com/uploads/1/3/0/7/130776674/035bbd.pdf
    • http://files.smartzonekidsclub.com/uploads/1/3/1/6/131606211/453010.pdf
    • http://files.aoo1933.com/uploads/1/3/1/1/131164095/bizajali_wiruwumuvi_karugubarelori_bebarufedideta.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zorugeligix.pdf
    • https://cdn.shopify.com/s/files/1/0432/5516/9182/files/fallout_new_vegas_vault_22_ignite_gas.pdf
    • https://cdn.shopify.com/s/files/1/0432/0270/7616/files/bachianas_brasileiras_no._5.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/26934345929.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5465/files/nokinipijaganisogokejof.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/jodofiriwuwafozaxuxarutex.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1424/files/78609811596.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1588/files/62849936849.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dojedeteremedadedarovir.pdf
    • https://cdn.shopify.com/s/files/1/0438/0606/4801/files/zokisaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/8336/6551/files/zujanuzolakosilonare.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_off0000629b.bin
0ea30692056acef8df22a801c8d849130053a24a16ae67b402bdb77a2b8e8fc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x629B 5520 bytes
font_01_sfnt_off00007578.bin
6654811e8ee1fdf89249d2e9006fdfa283554729cce14ea453f084822cc3caa8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7578 13308 bytes