Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e761f6a1121bb17…

MALICIOUS

PDF

44.4 KB Created: 2020-08-14 20:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a23df0d49e787292502e6ef9e3572e8 SHA-1: 539f48e0be6c7d56059dc89f8806fee58728ebd8 SHA-256: 5e761f6a1121bb1781d8b6e8f73c29752d8193ffb197cbb5a42672616a9c155f
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'pdf to spreadsheet converter free' and a URL that matches the redirector. Heuristics indicate a malicious redirector, a link farm, and a lure for browser extension installation, suggesting a social engineering attempt to trick the user into clicking malicious links.

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.com/pify?keyword=pdf+to+spreadsheet+converter+free
    • http://bamumoza.deborahshepardbooks.com/uploads/1/3/1/8/131857054/7629b2d.pdf
    • http://nukefire.onceuponastitchboutique.com/uploads/1/3/2/6/132681670/6613300.pdf
    • http://giboxetar.bloombargain.com/uploads/1/3/1/0/131070161/1937935.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4852/6246/files/tatatopofemodizip.pdf
    • https://cdn.shopify.com/s/files/1/0428/8439/9270/files/38896566602.pdf
    • https://cdn.shopify.com/s/files/1/0430/9444/2137/files/21571589119.pdf
    • https://cdn.shopify.com/s/files/1/0429/1382/4927/files/rpg_maker_mv_sprite_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6344/files/jaxudi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6933/files/16743200013.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/meragavafeduxilaxopuxaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/2149/2643/files/dividing_polynomials_by_monomials_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/6123/8168/files/kepowosakufinew.pdf
    • https://cdn.shopify.com/s/files/1/0430/2677/6227/files/wimapilemifugafudo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8925/5847/files/fonafamepeletot.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_off0000707c.bin
583fe1617337344236abfa1aab75e3624f50dcc467fb3dac4838fc1c6be4cc7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707C 5272 bytes
font_01_sfnt_off0000826e.bin
6b0ceee56fa64207d9eaf7324f39437f56f4969b977e1d1121d63089aa4b8973		 pdf-font-stream PDF embedded font (sfnt) at offset 0x826E 10060 bytes

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