Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fbb71a805d6c396…

MALICIOUS

PDF

34.3 KB Created: 2020-08-20 05:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ee919516360c16dbbde4177bd95e726 SHA-1: 9e569b72f1377108a68bb0db216f5f20f3ade77f SHA-256: 6fbb71a805d6c396c1cf9a8293fb39d29c3f273cfa70e1b3248954e97d61432c
202 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. Heuristics indicate a social engineering lure, specifically a fake download button and a prompt to install a browser update, which is a common tactic to trick users into clicking malicious links. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=paruthiveeran+cut+songs++masstamilan
    • http://posawowu.geoffleavenworth.com/uploads/1/3/1/3/131398027/dulobe.pdf
    • http://lesixoga.cedartreeproject.com/uploads/1/3/1/4/131412713/f3bb4.pdf
    • http://bitunik.biyanananta.com/uploads/1/3/2/6/132696198/134df18a783d54.pdf
    • http://kepivuvam.crossfitremix.com/uploads/1/3/1/4/131453247/ruwabaje-fugoku.pdf
    • http://files.erinearlywine.com/uploads/1/3/1/4/131453177/d7788.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5725/9420/files/84867541218.pdf
    • https://cdn.shopify.com/s/files/1/0435/3743/2744/files/kannada_opposite_words_list_in.pdf
    • https://cdn.shopify.com/s/files/1/0439/5070/2750/files/biodiversity_loss_and_its_conservation.pdf
    • https://cdn.shopify.com/s/files/1/0437/2843/7409/files/famonimukisizodutovezof.pdf
    • https://cdn.shopify.com/s/files/1/0433/6232/0536/files/telod.pdf
    • https://cdn.shopify.com/s/files/1/0440/9291/5864/files/xexuzidupawafotup.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6841/files/gexutumivujemugo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0337/8839/files/fosofonuwokimar.pdf
    • https://cdn.shopify.com/s/files/1/0437/4410/0506/files/xereterir.pdf
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/panatidupunuza.pdf
    • https://cdn.shopify.com/s/files/1/0437/5488/1185/files/illicit_financial_flows_in_zimbabwe.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/57798057403.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_off00004898.bin
423ce2ec2fed711f4442c365715c7f87c25def1fabefcf3116e19c25ef48bdfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4898 5272 bytes
font_01_sfnt_off00005a5e.bin
be01cdcc852adc838f7cde6fad357e4b5a56e81f1d88c4c978f62df99579a457		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A5E 9944 bytes

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