Malicious PDF — malware analysis report

Static analysis result for SHA-256 042940e61c8bd80d…

MALICIOUS

PDF

40.3 KB Created: 2020-09-17 19:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebb913cd963a8750f4bc27242730a20e SHA-1: 8038c611521c729a07db3adcbdafbc2c2fb53086 SHA-256: 042940e61c8bd80d5ad5a1506d43794138d5293e90a90b0ab6be7cf121102b9c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to manipulate search engine results. The presence of multiple external PDF links suggests an attempt to direct users to potentially malicious content or phishing sites.

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.link/wix?keyword=the+joy+of+writing+sex+pdf
    • http://zobol.proclean1.net/uploads/1/3/2/6/132681337/pafurowuxisig.pdf
    • http://vitajeli.whereintheworldiscaseykey.com/uploads/1/3/0/7/130775432/5523435.pdf
    • http://jemoduju.aftercrafter.com/uploads/1/3/1/0/131070306/tosupa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://81d6232b-7d35-4b80-b076-16055770a2d5.filesusr.com/ugd/229b11_6937ea822f524db7b528adc4ee6f3f5a.pdf?index=true
    • https://d702b260-5154-4497-9e00-08242ec75fde.filesusr.com/ugd/b48b60_06dc7a0daaf04bf58a36724667b258b0.pdf?index=true
    • https://0aac34e1-74a6-4e7a-94bd-7d8e541bd929.filesusr.com/ugd/7fedcf_f4432ac6b3474dca87aeaa5b95286f16.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0428/1057/2967/files/50109825224.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/77085360951.pdf
    • https://cdn.shopify.com/s/files/1/0433/8191/5809/files/cancer_causes_and_prevention.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2551/files/60990850861.pdf
    • https://cdn.shopify.com/s/files/1/0432/7702/5446/files/ejercicios_de_traslacion_de_figuras_en_el_plano_cartesiano_para_secundaria.pdf
    • https://cdn.shopify.com/s/files/1/0434/5757/7122/files/whirlpool_gas_range_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7649/files/legeso.pdf
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/sarezivizusamonixorane.pdf
    • https://cdn.shopify.com/s/files/1/0461/8479/2227/files/98029837748.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_off00005fe5.bin
d9751d598caee5539afe57437717a44fe483aea474f522cc6577f949b75d622b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE5 5348 bytes
font_01_sfnt_off0000723c.bin
2f1a5d372bb1cebe36e7369beae7258c9fe173fb0dc612ad5c1e13e31d5e7b8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x723C 10036 bytes

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