Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bcae63f6a3aaaa…

MALICIOUS

PDF

39.1 KB Created: 2020-08-31 09:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7eb1edbe103be7a90ea6e2b21ff688f6 SHA-1: 9770ba634f2d7ca5739777a0a6643b8ac46ebcb1 SHA-256: 77bcae63f6a3aaaa46de569792978389d349d720daf006097b2ffb2915df2b75
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify-hosted PDFs, which is indicative of SEO poisoning or a link farm. One of the primary links, 'https://ttraff.cc/wix?keyword=maqueta+de+secciones+conicas', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL.

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.cc/wix?keyword=maqueta+de+secciones+conicas
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4184/1571/files/revenue_management_im_hotel.pdf
    • https://cdn.shopify.com/s/files/1/0430/8510/3255/files/95961955190.pdf
    • https://cdn.shopify.com/s/files/1/0431/7403/5607/files/sesupig.pdf
    • https://cdn.shopify.com/s/files/1/0431/9599/0175/files/volvo_s40_2005_manual.pdf
    • https://static.usrfiles.com/ugd/83b1b3_e74a85063e0f48acb1cb898030d17f11.pdf
    • https://cdn.shopify.com/s/files/1/0438/5007/2224/files/amusement_park_games.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2221/files/vagixatimodipaken.pdf
    • https://cdn.shopify.com/s/files/1/0429/6710/5687/files/majenobaputegoxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/gedel.pdf
    • https://cdn.shopify.com/s/files/1/0431/4297/1553/files/gawuje.pdf
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/sons_of_anarchy_torrents.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_off00005ccf.bin
ce323c02cd6513a43b2fad2d18d1f08c01b94add292b53addd3722c185a534cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CCF 4936 bytes
font_01_sfnt_off00006daa.bin
73dddb17b1d0b121e778a46cbd2ae11b9ee2ae286848b3989445f8910e6f89dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DAA 10656 bytes