Malicious PDF — malware analysis report

Static analysis result for SHA-256 7819053665ab1b98…

MALICIOUS

PDF

52.8 KB Created: 2020-08-15 18:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5619800edad61bfa6d9e5603e88e5a67 SHA-1: 4f241b31513ee0825a3e816dbd75df501e768304 SHA-256: 7819053665ab1b98db64005186f4f2c27ed32e54eee32d609d2e53f87533045b
162 Risk Score

Malware Insights

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

The PDF file contains embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a lure for an 'inventory stock register template'. The presence of numerous PDF links, many pointing to Shopify domains, indicates a link farm strategy, likely to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.cc/pify?keyword=inventory+stock+register+template
    • http://nivegojej.perthkitchendoorreplacement.com.au/uploads/1/3/1/8/131857334/3761154.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/4470/9276/files/analytical_aptitude_questions_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/9874/3719/files/lefuvetarirabomop.pdf
    • https://cdn.shopify.com/s/files/1/0437/5104/7329/files/kigegaxemed.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1097/files/chemical_admixtures_for_concrete_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6823/files/clinical_electroencephalography.pdf
    • https://cdn.shopify.com/s/files/1/0434/1491/3191/files/6075567823.pdf
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/sindhi_alphabet_with_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mijafovaginidobu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4096/4759/files/retid.pdf
    • https://cdn.shopify.com/s/files/1/0434/1055/5041/files/74009454239.pdf
    • https://cdn.shopify.com/s/files/1/0430/7720/6165/files/sequelize_eager_loading.pdf
    • https://cdn.shopify.com/s/files/1/0429/4482/3452/files/dufifopojoxoxujop.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_off00008fc7.bin
1cf90fce540846f75f28b500be4bb133dfb4f4ba5be04f08139d9ab28a57c1eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC7 5416 bytes
font_01_sfnt_off0000a231.bin
50977e0bbdbb1235f8032570c5f0a80f4de59858e50179245e887ea1554df02c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA231 10604 bytes

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