Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1630bfd7cacec24…

MALICIOUS

PDF

40.2 KB Created: 2020-09-17 00:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a86c6949f17960074f6678132d068237 SHA-1: 7361e432defe4fb24c7ff2ca78f6bf70e81d4d00 SHA-256: d1630bfd7cacec24f20b33f2377b9346c6783bf1094daa9b899cd8d56f783479
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one identified as a malicious redirector. The document body, though obfuscated, contains text related to 'chemical equilibrium answers' and includes the primary malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.club/wix?keyword=chapter+16+chemical+equilibrium+answers
    • http://files.brittanylynnphoto.com/uploads/1/3/1/3/131379730/7748327.pdf
    • http://zepovez.valdeckerphotography.com/uploads/1/3/1/8/131856331/togopagi.pdf
    • http://files.bgjsr22.com/uploads/1/3/2/6/132681993/8c3f51c014448c.pdf
    • http://nopapud.johnnyomusic.net/uploads/1/3/0/7/130775953/lafopubixosefijane.pdf
    • https://bee4ac06-291f-441f-bb81-a403a65caeb5.filesusr.com/ugd/d2759c_f25156541dbd4e33bfec42cceb2c5e96.pdf?index=true
    • https://d5d7bcb1-0078-4473-be73-6f93bd12a019.filesusr.com/ugd/4a2613_f2445b3885cc4c60983103d1c77759cc.pdf?index=true
    • https://24e7faa9-e489-455c-92e6-0e2b3d1e0c03.filesusr.com/ugd/12daa7_dce15864050046d6a18de59deb23b0b1.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0438/3758/7606/files/fodeminajifam.pdf
    • https://cdn.shopify.com/s/files/1/0434/6596/5718/files/excel_indirect_sheet_name_with_space.pdf
    • https://cdn.shopify.com/s/files/1/0440/9756/8920/files/rti_act_2020_amendment_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/3391/1705/files/86501149386.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65496272691.pdf
    • https://cdn.shopify.com/s/files/1/0431/9671/1069/files/90505161296.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_off00005e61.bin
6ddc8e7ffcfae6657c769c12a8d0e79252ebfe58abe254581d1ece2bad11f82c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E61 5644 bytes
font_01_sfnt_off0000717b.bin
2aebab01b68c62c0490e39d298abceef30a084bd7bf9c0b4d218367fdb3dc7d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x717B 10108 bytes

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