Malicious PDF — malware analysis report

Static analysis result for SHA-256 da79e9675d3f8387…

MALICIOUS

PDF

41.6 KB Created: 2020-08-07 09:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f118284f8f1e7bfbcb582b700ef1623 SHA-1: ae327bdd7a6ad2099f5e42461f029ee27bf272e4 SHA-256: da79e9675d3f8387111d906ba1c8b875a0d2a0826eb44e5f47d9d6d2ea382ece
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded links suggest a lure related to 'isotopes of hydrogen worksheet' to trick users into clicking the malicious URL. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which are hosted on Shopify, likely to obscure the malicious redirector. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/wb?keyword=isotopes%20of%20hydrogen%20worksheet
    • http://kexaxed.eclaudetteliterary.com/uploads/1/3/1/6/131606407/zafugetexotagi.pdf
    • http://files.letspaintarabic.com/uploads/1/3/2/8/132815123/lilezezedumisuvix.pdf
    • http://files.northwoodsquiltguild.net/uploads/1/3/0/7/130776246/9d87468.pdf
    • http://files.zionmarietta.org/uploads/1/3/1/4/131408854/wugava-wudakezevujalog-xogarudetagikej-terosibe.pdf
    • https://cdn.shopify.com/s/files/1/0436/8970/5625/files/59070640240.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2615/files/pandas_reorder_columns.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7348/files/wasorutazudapiseb.pdf
    • https://cdn.shopify.com/s/files/1/0434/1871/4264/files/67002775010.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/mod_menu_for_gta_5_xbox_360.pdf
    • https://cdn.shopify.com/s/files/1/0428/3452/6375/files/68917760954.pdf
    • https://cdn.shopify.com/s/files/1/0432/9878/3382/files/samuduf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nujogopuju.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/pakistan_bait_ul_mal_scholarship_form_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/1335/8247/files/student_biodata_format_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1311/files/vudojome.pdf
    • https://cdn.shopify.com/s/files/1/0434/1995/9463/files/45273287501.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/vupogefifavani.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064c2.bin
c61d8b1ad8526286e8a26f496d2dfbc5ac4923d035054a4c2ffe8c3afb06c26f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C2 5256 bytes
font_01_sfnt_off000076bc.bin
65dda54063431e0874eb5bf0d7ab6d4521761638e3987c2d3569a21a32e78b9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76BC 10244 bytes

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