Malicious PDF — malware analysis report

Static analysis result for SHA-256 7628ae7fcdb32bdf…

MALICIOUS

PDF

57.0 KB Created: 2020-09-04 01:39:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3a17e9b3216a5ee8f3dc80b8475c374 SHA-1: 9cfac1592f1f51f37e9836439a39f69b8a95d034 SHA-256: 7628ae7fcdb32bdf6d6bf603c13e3e6bdad86cf59e74e77beb80b4add6e62907
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links and a document body that mimics a user guide, directing the user to a suspicious URL (https://ttraff.club/wix?keyword=equinix+customer+portal+user+guide). Heuristics indicate this URL is a malicious redirector and the PDF itself is part of a link farm. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.club/wix?keyword=equinix+customer+portal+user+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7929/3338/files/73695049836.pdf
    • https://cdn.shopify.com/s/files/1/0434/7016/0032/files/clinical_chemistry_marshall.pdf
    • https://cdn.shopify.com/s/files/1/0463/0370/7298/files/funapuvexefijuxazafenutu.pdf
    • https://static.usrfiles.com/ugd/96564c_ebb885f18cc244738aa3c7722270b810.pdf
    • https://cdn.shopify.com/s/files/1/0457/3724/6876/files/functions_of_computer_memory.pdf
    • https://cdn.shopify.com/s/files/1/0432/3311/6317/files/98393054720.pdf
    • https://cdn.shopify.com/s/files/1/0433/7264/2460/files/telegraph_avenue_michael_chabon.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jaled.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8216/files/creative_arts_grade_7_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/4111/9653/files/host_html_on_github.pdf
    • https://cdn.shopify.com/s/files/1/0437/8938/5888/files/jitufiremi.pdf
    • https://cdn.shopify.com/s/files/1/0436/2996/9561/files/25908786402.pdf
    • https://cdn.shopify.com/s/files/1/0435/3064/9749/files/34237884104.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_off00009f18.bin
c4fffbfef0c8f1e8c0ae9716143a36087474b1d75cb1849e69cad1c100c3d9ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F18 5544 bytes
font_01_sfnt_off0000b1da.bin
5b546c88c0092f87544db7cdefb1f365dd9b948875b51430ad6855b26435504c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DA 11224 bytes

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