Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7a6bec36c06589…

MALICIOUS

PDF

55.1 KB Created: 2020-08-10 13:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb330ebeee1b9f004fa23d3801340658 SHA-1: 5af9eaf1746c687902d35760db3e118ee70d6e89 SHA-256: 1a7a6bec36c06589957bd9cc63163de61e7f1fa6d1b82de4d2139dd1232d862d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to a malicious redirector (ttraff.cc). The document body, though garbled, suggests a lure related to medical analysis, which is a common tactic for phishing or malware delivery. The ML classifier strongly flagged this PDF as malicious, and the presence of a known malicious redirector confirms the intent to lead the user to harmful content.

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=les+diff%25C3%25A9rents+types+d+analyses+m%25C3%25A9dicales+pdf
    • http://files.thefinishdepot.com/uploads/1/3/1/3/131383478/dofedij_todonubibupelot.pdf
    • http://files.eatsxm.com/uploads/1/3/1/8/131856306/bumuniditati_fineg_refirula.pdf
    • http://files.espin-inc.com/uploads/1/3/1/0/131071067/nigunata-jevipule.pdf
    • http://pipawute.downtownsundry.com/uploads/1/3/1/3/131380729/tirefafo.pdf
    • http://fidax.betheluccspringgrove.com/uploads/1/3/1/1/131164250/1babd430715.pdf
    • https://cdn.shopify.com/s/files/1/0432/8095/7598/files/data_structures_and_algorithms_made_easy_second_edition_narasimha.pdf
    • https://cdn.shopify.com/s/files/1/0430/2913/5514/files/43373147316.pdf
    • https://cdn.shopify.com/s/files/1/0440/3462/1590/files/ninematixotuvilubasuliko.pdf
    • https://cdn.shopify.com/s/files/1/0428/4727/3116/files/10693869544.pdf
    • https://cdn.shopify.com/s/files/1/0432/8253/0472/files/6733030443.pdf
    • https://cdn.shopify.com/s/files/1/0447/4650/6391/files/an_introduction_to_political_theory_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/8299/8170/files/bebowogolexasonudofuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/7906/6009/files/fezumikunilaratit.pdf
    • https://cdn.shopify.com/s/files/1/0448/0329/3346/files/blood_type_ab_diet_plan.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/beretiwivegevedi.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/cmm_capability_maturity_model.pdf
    • https://cdn.shopify.com/s/files/1/0428/6844/1254/files/lapebagabususabapavi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/simple_past_tense_exercises_perfect_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5130/files/wefoxaxunividogup.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/
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/simple_past_tense_exercises_pe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000087ff.bin
a5142f3be9220711cfdd873df97b6547eacf86339ef9b30ba0720c8223f41d4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87FF 5484 bytes
font_01_sfnt_off00009a50.bin
990246d7a6938665b18194cd4524760112ed0b27453087aa5ebc2874c36001a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A50 17124 bytes

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