Malicious PDF — malware analysis report

Static analysis result for SHA-256 11dfed82f3aedcf4…

MALICIOUS

PDF

42.9 KB Created: 2020-11-09 03:48:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2aca53277033fbc8d78d8e1ee0fd99dd SHA-1: 19505e02f8dffed69be49d2ecf40c4bb18782680 SHA-256: 11dfed82f3aedcf4cb9e4271c64187c46e9a9dd484f43a46b90f44383b7aa305
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL promising free gems for 'Zombs Royale' with no human verification. The document body, though heavily obfuscated, contains a similar URL, reinforcing the lure. The presence of a large number of embedded links, many pointing to benign-looking PDF files, suggests a link farm used for SEO poisoning or to obscure the malicious redirector.

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://traffmen.ru/123?keyword=zombs+royale+free+gems+no+human+verification
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/rukemizuxed-rekosovanive-botegaxofugi-rujufegepemur.pdf
    • https://susunagetasapok.weebly.com/uploads/1/3/4/4/134470533/7701885.pdf
    • https://cdn-cms.f-static.net/uploads/4367303/normal_5f88ddd5d7b2c.pdf
    • https://lesajevix.weebly.com/uploads/1/3/4/3/134318042/8abc332.pdf
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/wijigomofiweb_lotitosede_jukis_dirum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ziwowemumuf.files.wordpress.com/2020/11/pdf_physique_chimie_terminale_s_hach.pdf
    • https://nijubar.files.wordpress.com/2020/11/34126271331.pdf
    • https://uploads.strikinglycdn.com/files/4781d7aa-f5e3-4712-8e86-4c872fdefd99/loparoduk.pdf
    • https://gitiwatubige.files.wordpress.com/2020/11/nifedaleni.pdf
    • https://gobifajoji.files.wordpress.com/2020/11/fobikogugipanesevokopesim.pdf
    • https://uploads.strikinglycdn.com/files/b65038b7-949e-4a41-867c-44f6953d3358/21st_wedding_anniversary_flower.pdf
    • https://xixojis.files.wordpress.com/2020/11/pupelujoguwagelevakowofaf.pdf
    • https://uploads.strikinglycdn.com/files/66aeb316-f5af-48c9-9db7-2b8758d2bdb3/88033007167.pdf
    • https://xusupej.files.wordpress.com/2020/11/tarulimafufi.pdf
    • https://fegaretu.files.wordpress.com/2020/11/gesetisamisovubabaxavidum.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_off0000661e.bin
16a3ca2db43fa49ac90455b3c33512fafc8daab0af1d2d2b7d47feb933c3602a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x661E 5556 bytes
font_01_sfnt_off000078ee.bin
16fdaa4d5ffe996ca3142521d6aa92fb0f4df9a6f31c844c2fdaa01694633521		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78EE 10852 bytes

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