Malicious PDF — malware analysis report

Static analysis result for SHA-256 1233f71631fd2136…

MALICIOUS

PDF

72.9 KB Created: 2020-09-19 23:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0281236deaa429981ae34eb78f2b9cad SHA-1: 4f9a4a2392f01601534c36890d2bb240cefd16c0 SHA-256: 1233f71631fd2136a25e908518f87cca001fc8c3c50a7d10f0e394edcb365cc9
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the PDF is designed to redirect users to malicious infrastructure, likely for phishing or to download further malware.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/pify?keyword=fruits+basket+tohru+x+kyo
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://95eb8eba-8c84-4a25-8076-64a7f3595ffc.filesusr.com/ugd/c57cae_4a97ac8d849e40d4b3989c2202cdd287.pdf?index=true
    • https://6b98e943-5a18-4d86-a86e-83f11c62545f.filesusr.com/ugd/d6af85_1a1ec8a330a54eefaa2af3f3f04d11ea.pdf?index=true
    • https://a425a822-6d13-48a9-bf47-d96c06c876f7.filesusr.com/ugd/ca847e_117a869eb242482da9166d8dc5d5dd58.pdf?index=true
    • https://c51a720b-ec4b-4bcc-b817-54f730d08b22.filesusr.com/ugd/2f7815_db4e92b282754f4890323f25258dcdbf.pdf?index=true
    • https://0ff57d7c-11a6-4be7-a933-e34173d3bc93.filesusr.com/ugd/610d21_f71717aaf91d435d98ee9d86ba555300.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/3175/5932/files/bosch_maxx_4_user_manual.pdf
    • https://18588217-d4ad-4f2c-b602-a70f1a137d19.filesusr.com/ugd/7598fa_d608f6be427640f5904cb97092c558f5.pdf?index=true
    • https://06689f04-911b-4e6f-b750-5730cfa76f89.filesusr.com/ugd/205ae4_15e8105cc5c7440fa90e8984d80497c0.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0428/9894/8255/files/zarijufosomasavid.pdf
    • https://cdn.shopify.com/s/files/1/0432/2420/3424/files/31381783453.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f3.bin
933c11ec3ba4ef990cdda13d37f4d3fc7bcfbf00eb5c0a26f982b8c5d2f83840		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F3 3592 bytes
font_01_sfnt_off0000e2b0.bin
e2171e965486764cb90c61ca573b4ec06ea280fee0fd3ef7c68cad0d0c02fd03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B0 5072 bytes
font_02_sfnt_off0000f3f8.bin
003789c89634a6ed87d5f6ce1760ffea70b821be1ee6df96f76adf27ec805940		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 10168 bytes

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