Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e5f4115822e2b5…

MALICIOUS

PDF

43.0 KB Created: 2020-09-09 01:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee567a2c244be41b6415b0a595fe7fbe SHA-1: af6cbc3e7ea2a83fc3de57e11637f6168819fa13 SHA-256: 71e5f4115822e2b5525064c6ea6b3d41d48562bdfb6bf6b344ce2beed8e8dead
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm used for SEO manipulation or to distribute malicious content. 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.me/wix?keyword=spider+solitaire+game+free++pc
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1937/0659/files/53139400619.pdf
    • https://cdn.shopify.com/s/files/1/0447/9421/6599/files/79982090522.pdf
    • https://cdn.shopify.com/s/files/1/0439/0017/4504/files/udp_tracker_istole_it_80_announce.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/digolevebuletigaxal.pdf
    • https://cdn.shopify.com/s/files/1/0430/3159/3113/files/cat_crying_ringtone_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/0772/0099/files/apostila_aula_de_violo_para_iniciantes.pdf
    • https://cdn.shopify.com/s/files/1/0434/3064/1826/files/42639211037.pdf
    • https://cdn.shopify.com/s/files/1/0465/0598/4158/files/fishing_bundles_guide_stardew.pdf
    • https://cdn.shopify.com/s/files/1/0432/1764/9819/files/descargar_pokemon_oro_para_my_boy_free_android.pdf
    • https://cdn.shopify.com/s/files/1/0438/0046/1474/files/59231765607.pdf
    • https://cdn.shopify.com/s/files/1/0432/0608/2717/files/2503835306.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/biomedical_model_of_health_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/srimad_bhagavad_gita_in_bengali_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/79296207473.pdf
    • https://cdn.shopify.com/s/files/1/0435/8914/0643/files/falciform_ligament_vs_ligamentum_teres.pdf
    • https://cdn.shopify.com/s/files/1/0431/5398/1589/files/60791845620.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/achondroplasia_adalah.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_off00006820.bin
160d92373222151f59158b69014a5b01e290fd8cc68859aa4064f3298460c7cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6820 5580 bytes
font_01_sfnt_off00007b0c.bin
197b9a88c9f51389401f1ae74fc7a2ca3b735b8a74c71dbdf4932c5c26e4470f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0C 10772 bytes

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