Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0ac0f7b92a964f…

MALICIOUS

PDF

45.7 KB Created: 2020-10-09 08:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 261afc7e952676080eeccf4e7159d468 SHA-1: d5af9717bdf8cbaab1f0b556a5ef6efa19bfbcfd SHA-256: aa0ac0f7b92a964f773a7ddda5ba61232698ef6cdb534ca7178746aaec565c6a
132 Risk Score

Malware Insights

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

This PDF document contains multiple embedded URLs and a primary redirector link, indicating a phishing or redirection attempt. The ML classifier strongly flagged this PDF as malicious, and heuristics confirm it links to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a lure related to the NDSS Symposium 2020, likely intended to trick the user into visiting a malicious site.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.club/pify?keyword=ndss+symposium+2020 In PDF document text
    • http://files.tinagutierrezartsphotography.com/uploads/1/3/0/7/130775383/remax-taxopugazaledu-fuluxibejurifuj-lavosiraleset.pdfIn PDF document text
    • http://roger.nwgirlstock.org/uploads/1/3/0/7/130739783/3537249.pdfIn PDF document text
    • http://files.brentfields.com/uploads/1/3/2/3/132303020/wotulegasad.pdfIn PDF document text
    • http://files.jjsatthecopperpot.shop/uploads/1/3/1/0/131069906/vepikofemuko.pdfIn PDF document text
    • http://files.workwithelise.com/uploads/1/3/1/3/131380849/f265e.pdfIn PDF document text
    • http://files.ebenezer-baptistchurch.com/uploads/1/3/2/6/132682303/liviwatizeguj-netugepoxitawoj-xonoja-buzux.pdfIn PDF document text
    • https://site-1039161.mozfiles.com/files/1039161/36188198735.pdfIn PDF document text
    • https://site-1040182.mozfiles.com/files/1040182/xubukemu.pdfIn PDF document text
    • https://site-1037273.mozfiles.com/files/1037273/kizafogebitomejaruxafetul.pdfIn PDF document text
    • https://site-1038341.mozfiles.com/files/1038341/24209358154.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7647295a-c19b-4dc2-9c53-3a68bcf8a9b2/fefolololozorisunasis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f50dbde6-90c5-4342-b6c1-d7b12cb14dd3/30580024307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81f82639-4b2e-491c-a060-73e6783ea0ad/xofomuvejojulif.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7613 5112 bytes
SHA-256: e7eb72a106ec980622c172108f49a662819e97df6f8b55f873e2d6e39e65abb9
font_01_sfnt_off0000877a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x877A 10156 bytes
SHA-256: aa5c6a348e454f4b2b0b06cb06348475a60797394f6b95d004fb8d58313512ec

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