Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d56deba0273d8d8…

MALICIOUS

PDF

41.8 KB Created: 2020-08-19 13:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfc59ee49504377fe898aacc6a97fd26 SHA-1: cef9681b0e7181f29b5f62a5c06bb3c079876dd9 SHA-256: 6d56deba0273d8d8798dc65a1d0d80280406af7f37895810395a1b8c46a20aec
162 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=java+7+u+80', which is also flagged by heuristics as a malicious redirector. The presence of a 'download button' heuristic further supports the lure-based attack pattern. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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://ttraff.ru/pify?keyword=java+7+u+80
    • http://tosamogov.ntx.afaparents.org/uploads/1/3/1/4/131453045/107c6de0e961b.pdf
    • http://files.priyankawali.com/uploads/1/3/0/7/130775856/vifiboxa-gafosule-fezekajogeku.pdf
    • http://zupanaw.brookesstreetkindynambour.com/uploads/1/3/2/8/132816042/491955385f1b23.pdf
    • http://poxut.backhausranch.com/uploads/1/3/2/7/132740519/xibazelugeveven.pdf
    • http://mozagij.thewildrowan.com/uploads/1/3/0/7/130775918/vukabumubune-navaw-wenixeniponoli-vigan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7278/2489/files/36269644949.pdf
    • https://cdn.shopify.com/s/files/1/0438/3480/2333/files/99171723135.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/31041368742.pdf
    • https://cdn.shopify.com/s/files/1/0433/5314/5495/files/6465551726.pdf
    • https://cdn.shopify.com/s/files/1/0434/3808/0167/files/24332454405.pdf
    • https://cdn.shopify.com/s/files/1/0431/5083/5876/files/28585559241.pdf
    • https://cdn.shopify.com/s/files/1/0463/1330/8325/files/lukavakadupef.pdf
    • https://cdn.shopify.com/s/files/1/0430/4506/0762/files/embroidery_thread_conversion_chart.pdf
    • https://cdn.shopify.com/s/files/1/0435/0623/7604/files/96783446919.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xopiforosolakalaxelavur.pdf
    • https://cdn.shopify.com/s/files/1/0434/5544/7202/files/jatadejekuziw.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_off00006658.bin
e3dc2754cea20afe2550b654e1c762997816d65a22e4b9d46e7b7d94fc8ef598		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6658 4836 bytes
font_01_sfnt_off000076e5.bin
efae5ae89aec643f8c210ae8acb17c8fbfbf5c72223f8e1104c09e470569e174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E5 10376 bytes

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