Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9b137c71b0fc12…

MALICIOUS

PDF

41.2 KB Created: 2020-08-23 06:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec7fcd61f56eb7de614063b6335f6b6b SHA-1: 76bb4f3e6a78a3977f477672efffd01a630c9c32 SHA-256: 3b9b137c71b0fc12c4de01ccf909c1680c289bad610fabeb875e8e69499850bb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector at 'https://ttraff.cc/pify?keyword=counting+numbers+worksheet+for+nursery'. The document body, though heavily obfuscated, contains references to this URL and other Shopify links, suggesting a lure to download further 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.cc/pify?keyword=counting+numbers+worksheet+for+nursery
    • http://files.massivemomentumnation.com/uploads/1/3/0/9/130969446/kutekapugupi.pdf
    • http://files.irenepruitt.com/uploads/1/3/1/6/131637306/wajileda.pdf
    • http://files.tedgoodden.net/uploads/1/3/2/6/132681325/7770933.pdf
    • https://cdn.shopify.com/s/files/1/0449/8613/8792/files/business_driven_information_systems_baltzan.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5858/files/tisudawiliwovaxi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/creative_writing_exercises_for_high_school.pdf
    • https://cdn.shopify.com/s/files/1/0429/5576/7967/files/fowifuzidame.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sosivizugepu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0844/8919/files/83075101238.pdf
    • https://cdn.shopify.com/s/files/1/0438/2241/6029/files/bd_diesel_performance_products.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/wunibuxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3685/1874/files/pudatovatimikod.pdf
    • https://cdn.shopify.com/s/files/1/0434/6262/3397/files/mekofibuj.pdf
    • https://cdn.shopify.com/s/files/1/0438/9342/4283/files/18581875590.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5575/files/33803357229.pdf
    • https://cdn.shopify.com/s/files/1/0435/5633/9871/files/candidiase_na_gestao_tratamento.pdf
    • https://cdn.shopify.com/s/files/1/0437/9541/5189/files/manualidades_con_botellas_recicladas_para_navidad.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006385.bin
73af8296ef67d0b4090efe83810fbc1f2584057150ecd7f79ebf510f4e938bcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6385 5240 bytes
font_01_sfnt_off0000754f.bin
a5d10ebb488b486b16665c5a1be20fae09459e48d0323720613878695d05a6ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x754F 10060 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.