Malicious PDF — malware analysis report

Static analysis result for SHA-256 7717312dedf74d37…

MALICIOUS

PDF

53.9 KB Created: 2020-08-18 16:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4acc3c816c94675736b5549bfdd3ceda SHA-1: f2d80b30990470dab24e00c1cf5e768e48d4458b SHA-256: 7717312dedf74d37ef422fc30c71a42f11808fdc057a9761acdb4c505291060f
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically a URL related to 'australian wound management clinical guidelines'. The document body, though heavily obfuscated, also contains this URL and numerous other links, many pointing to Shopify domains hosting PDFs. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to a malicious site via a seemingly legitimate document.

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.com/pify?keyword=australian+wound+management+clinical+guidelines
    • http://winadedo.bonniewinters.com/uploads/1/3/0/8/130813848/91c555f5af5a.pdf
    • http://gupigep.ride615.com/uploads/1/3/2/6/132681670/5643761797.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6588/4323/files/bezoseguramijedepidiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/2301/4824/files/az_100_dumps_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/8400/2981/files/42233385290.pdf
    • https://cdn.shopify.com/s/files/1/0434/2048/3751/files/90296569843.pdf
    • https://cdn.shopify.com/s/files/1/0435/9507/1651/files/apec_card_nz_form.pdf
    • https://cdn.shopify.com/s/files/1/0436/9101/6347/files/62244802.pdf
    • https://cdn.shopify.com/s/files/1/0440/0611/3430/files/newalojumibi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9259/files/52878563827.pdf
    • https://cdn.shopify.com/s/files/1/0448/3081/8461/files/anime_girl_wallpaper_hd.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_off00009589.bin
485ad5935a76de092d05c3eb51764d3bdf4ddabeeed23488f54c299d1de22768
pdf-font-stream PDF embedded font (sfnt) at offset 0x9589 5340 bytes
font_01_sfnt_off0000a7a7.bin
7f5a0c0ccc58ff2b0a711a408690ed84a9c2a5fe265c221779b68ae121ad9a69
pdf-font-stream PDF embedded font (sfnt) at offset 0xA7A7 10300 bytes