Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95daa734ad365aa…

MALICIOUS

PDF

48.7 KB Created: 2020-10-21 03:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f66a024504bea4facac27047ab3d1fef SHA-1: 978d002c3a9fd430a4aa38786d74214ea29f9def SHA-256: e95daa734ad365aa57e2b6daf5e9b3f2c017d250dfd0f3e865ef8681ef1d8793
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/pify?keyword=download+shaders+kuda+mcpe+android'. This URL is presented as a download for game shaders, indicating a social engineering lure. The PDF also hosts a large number of external links, many of which are to S3 buckets, suggesting a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/pify?keyword=download+shaders+kuda+mcpe+android In PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/8431065.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/3502486.pdfIn PDF document text
    • https://jezaxegare.weebly.com/uploads/1/3/1/3/131380636/be07f.pdfIn PDF document text
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/kuzasofigiwuzoj-buvifanu-tewobusof-liwakilesepeju.pdfIn PDF document text
    • https://vevejeda.weebly.com/uploads/1/3/0/7/130776099/1156356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5f8742b5306e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5f87654ed7900.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/kibewojuxiruzopo.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/texejume.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/castrol_vecton_15w40.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/automotive_engineering_books_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/48718967538.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/66077155009.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/47273768974.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/91159771546.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/schwartz_absite_review.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/tirijokax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9198/3013/files/bidufuvanezedivala.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8353/9645/files/27592909004.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69F0 5468 bytes
SHA-256: 942fb018f826f3c36018d289299ae380641e6e33ffe63e3b328da4d6c8100bf0
font_01_sfnt_off00007c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C6B 10420 bytes
SHA-256: b7e5ffd143a90a4249ce433f63b031001e553f7906a418acb5d369ad98d0af0d
font_02_sfnt_off0000a042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA042 16064 bytes
SHA-256: 8ce0575abc6f686af3c1393089841c21814f5c4838d5adbe0d649219e58da802

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