Malicious PDF — malware analysis report

Static analysis result for SHA-256 50210be4852aa680…

MALICIOUS

PDF

43.5 KB Created: 2020-08-19 13:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 134f3a2195b6d71e03b066a47399fb9f SHA-1: 03a050714fd360341a49f81c6fcfec7556ea3b40 SHA-256: 50210be4852aa68075095696fae229217f803cd92e0517fbf661ff77f6216d02
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure known to host malicious content. The document body itself contains the primary malicious URL, suggesting a phishing or scam attempt. The ML classifier strongly supports the malicious verdict.

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=toefl+test+structure+and+written+expression+pdf
    • http://files.ryanacademy.org/uploads/1/3/0/8/130813409/pugal_turunudorax_gojotijet_dulax.pdf
    • http://files.tinyhomes.10losttribes.com/uploads/1/3/1/6/131607062/weliwozevu.pdf
    • http://files.thesixfriends.com/uploads/1/3/0/7/130775429/3128540.pdf
    • http://felen.in2yogalapeer.com/uploads/1/3/1/4/131437940/vafedufag-wosatazepa.pdf
    • http://files.jacquelinedoyle.com/uploads/1/3/0/7/130776416/1507261748b.pdf
    • https://cdn.shopify.com/s/files/1/0434/9588/2918/files/jq_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/0926/0190/files/reading_cvc_words.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/pefidufumaxuminunakam.pdf
    • https://cdn.shopify.com/s/files/1/0429/5570/2425/files/canada_visa_application.pdf
    • https://cdn.shopify.com/s/files/1/0431/3150/2749/files/31078377542.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8821/files/marathi_kadambari_online.pdf
    • https://cdn.shopify.com/s/files/1/0440/5270/9526/files/cat_980m_specs.pdf
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/pulse_width_modulation_and_demodulation_theory.pdf
    • https://cdn.shopify.com/s/files/1/0432/8767/5036/files/ripisakaveropagoxina.pdf
    • https://cdn.shopify.com/s/files/1/0432/0886/8001/files/56020531685.pdf
    • https://cdn.shopify.com/s/files/1/0431/4647/7725/files/79768504590.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/84009393610.pdf
    • https://cdn.shopify.com/s/files/1/0434/2897/0647/files/petsmart_grooming_promo_code.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_off00006ba1.bin
528de61e27774d14b7f1eee14a77b639f466439ce73749314dd8822bff23ff14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA1 5260 bytes
font_01_sfnt_off00007da8.bin
abe71db3a7d64d522a8bb51acc0781455888a7633949ebbb71b771545dd808d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA8 10076 bytes

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