Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4b85f3f9bec1e7…

MALICIOUS

PDF

62.9 KB Created: 2020-08-30 08:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec4d1be99ebcd5159068abcd1b2c56ba SHA-1: cd222041d47d77d1792c56caf14a730ce63d967c SHA-256: 7d4b85f3f9bec1e7dfa35b8d1c6d89c86aab2c5344bdb740462a3b87beb4159d
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/wix?keyword=psicologia+educativa+de+david+ausube', which is also listed as a malicious redirector. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, including one pointing to 'https://cdn.shopify.com/s/files/1/0431/5706/1788/files/gametizisuledorura.pdf'. The primary attack pattern appears to be luring the user to a malicious site via the redirector.

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.com/wix?keyword=psicologia+educativa+de+david+ausube
    • https://cdn.shopify.com/s/files/1/0431/5706/1788/files/gametizisuledorura.pdf
    • https://cdn.shopify.com/s/files/1/0443/6888/7964/files/bath_and_body_works_online_application.pdf
    • https://cdn.shopify.com/s/files/1/0434/0157/6602/files/cracked_games_sites.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/mipenolagugusetuxomig.pdf
    • https://cdn.shopify.com/s/files/1/0431/2704/6298/files/44536644751.pdf
    • https://cdn.shopify.com/s/files/1/0429/6690/9081/files/ddlc_poems_guide.pdf
    • https://static.usrfiles.com/ugd/ac51ce_9c1f826942594ac09aea31ba92c26056.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_bf6061a67c9b490081881dc0a7d67d9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_76409856b9294693a9f06cf6e0a0edd5.pdf
    • https://static.usrfiles.com/ugd/b8c837_6fe114e92fed432bb41651a335f86c31.pdf
    • https://cdn.shopify.com/s/files/1/0439/5125/9803/files/mawakosa.pdf
    • https://cdn.shopify.com/s/files/1/0448/5165/8914/files/catalaunian_fields.pdf
    • https://cdn.shopify.com/s/files/1/0430/0960/5791/files/busch_wildlife_fishing_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/4855/0050/files/acoustic_and_auditory_phonetics_keith_johnson.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_off0000b6cf.bin
62ba4966d89af3a2ce7b99ea280cc590e8b4cb951459dfd9764e6895449397d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CF 5212 bytes
font_01_sfnt_off0000c894.bin
e5a167870c2c898425aa3003658c5aea35aaa2c9c64bf1ed30a89494c47b4dcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC894 11124 bytes

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