Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2377d4ef611539e…

MALICIOUS

PDF

45.2 KB Created: 2020-11-08 15:49:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: fc1f4fbc6018a940d8869d3d851165ff SHA-1: 5ad5cafe2cf549a3f04e76492ca82cef02a5623c SHA-256: c2377d4ef611539e30736712281c77e418a03aba8073a97e9e044aff22d5d434
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://traffking.ru/123?keyword=samsung+allshare+play+app'. Additionally, a PDF SEO link farm heuristic indicates the presence of numerous external links, with 'https://s3.amazonaws.com/tokatefozude/bella_sara_codes_for_foals.pdf' being one example. The ML classifier also strongly flagged this PDF as malicious, and a remote-support tool lure heuristic suggests deceptive content within the document.

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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://traffking.ru/123?keyword=samsung+allshare+play+app In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375907/normal_5f8d5f1323b3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379733/normal_5f92d43c2381b.pdfIn PDF document text
    • https://poxotedodesogin.weebly.com/uploads/1/3/4/3/134305686/wudamul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374177/normal_5fa55deea898b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tokatefozude/bella_sara_codes_for_foals.pdfIn PDF document text
    • https://dekajerige.files.wordpress.com/2020/11/jiwanelasadewamexijukana.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/descent_with_modification_means_that.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/92689869135.pdfIn PDF document text
    • https://dukitavix.files.wordpress.com/2020/11/addition_of_decimals_word_problems_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/49683689482.pdfIn PDF document text
    • https://nekufinomo.files.wordpress.com/2020/11/39814317166.pdfIn PDF document text
    • https://pumagivox.files.wordpress.com/2020/11/chatroulette_omegle_alternativ.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000652e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x652E 5080 bytes
SHA-256: 0a780c667c41265451bce9a9c7cd01795018eb03c70ef486324468ca7ca45675
font_01_sfnt_off00007639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7639 10360 bytes
SHA-256: 4aecc70a1c4b091f90cd1e4d208cd879f6db6cbf54f2f2fffc856fdc2787f9c7
font_02_sfnt_off000099a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99A7 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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