Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e5fabc2d333c4c…

MALICIOUS

PDF

43.9 KB Created: 2020-08-07 07:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6a5fa39a2e1e8a0121a5c0fd3a3f26cd SHA-1: 22f74eba5caf57a23a9f39b53dcac207a04fa7df SHA-256: b6e5fabc2d333c4cd311f0e520e6aec1b2e9c51761352e8ac7c0e24530ee2c44
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of a 'download button' heuristic and the structure of the embedded links suggest a lure to download further malicious content or be redirected to phishing sites. Although no scripts were explicitly extracted, the PDF structure and link farm indicate a malicious intent to redirect users to potentially harmful content.

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=aboriginal+dot+painting+templates+pdf In PDF document text
    • http://files.ukofc7464.com/uploads/1/3/1/4/131437107/6caaf6aeb399.pdfIn PDF document text
    • http://files.maartenvanhasselt.com/uploads/1/3/0/9/130970016/jekepakasafa_jasaziviwo.pdfIn PDF document text
    • http://files.b2autodesigns.com/uploads/1/3/0/7/130775977/debut.pdfIn PDF document text
    • http://rivudumam.gracefulheartstherapy.com/uploads/1/3/0/7/130775734/5667317.pdfIn PDF document text
    • http://gewuwok.raniyoung.com/uploads/1/3/1/1/131164312/fufuriputegiz-wejawuxidaki-resaseref-sukojo.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://cdn.shopify.com/s/files/1/0427/5005/0460/files/savodugufagizanigima.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6175/5560/files/43579253626.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/81465919608.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67295211500.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6761/2067/files/raguvemikibirapikepazon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6779/3820/files/category_theory_for_programmers_the_preface.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4856/6933/files/16743200013.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4457/7178/files/xikog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1116/8664/files/vuzexojasidikazodusoxavej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0414/7350/files/61244064142.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3146/0002/files/zajuwitoziduko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7194/7423/files/49694942240.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nuxekenosagulowagegur.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_off0000611d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x611D 5280 bytes
SHA-256: b186d3fbdfbac7279f6c6e0325ceb4c557ae63c6131bfcc6b56d22b47943a4ba
font_01_sfnt_off000072ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72EA 9736 bytes
SHA-256: d753bf4bf14ecf963c510c944c6f50db2f9a30ca3360b2ee19bcfcd9b46da128
font_02_sfnt_off00009433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9433 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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