Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a30aab2a478f112…

MALICIOUS

PDF

41.2 KB Created: 2020-08-29 04:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5728f4e92e335cbbf54eee715a4e683 SHA-1: 6c933560044becbd123619825e336a03e22c9873 SHA-256: 6a30aab2a478f112ec2ca787c0d930538b002bc75518ae8f2d5cae4cd9aea5e6
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=download+1540.3+update'. The document body also contains this URL, suggesting it's the primary lure. The presence of numerous other links, many pointing to Shopify, indicates a link farm strategy, likely for SEO poisoning or to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=download+1540.3+update
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0431/1184/1958/files/alfa_laval_plate_heat_exchanger_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/1599/4529/files/bezepavamipaborozew.pdf
    • https://cdn.shopify.com/s/files/1/0438/6498/1664/files/nuxuzas.pdf
    • https://cdn.shopify.com/s/files/1/0437/9272/8224/files/60117426325.pdf
    • https://cdn.shopify.com/s/files/1/0435/3287/7976/files/frequency_hopping_spread_spectrum.pdf
    • https://cdn.shopify.com/s/files/1/0434/2598/8757/files/21416722654.pdf
    • https://cdn.shopify.com/s/files/1/0431/4519/9777/files/fevonutedabatudivoke.pdf
    • https://cdn.shopify.com/s/files/1/0437/2017/9864/files/risejikaxugopifakovewikof.pdf
    • https://static.usrfiles.com/ugd/b8c837_cda46ba4730747419bd7f9e1bb3a2070.pdf
    • https://static.usrfiles.com/ugd/b8c837_84be9afa38154b139808240a5b1dc8c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_506ecb35fdbd4189b8bc2a72fbc73606.pdf
    • https://static.usrfiles.com/ugd/b8c837_ebaa5da43e824dd68ca5ff8a5f2a29fc.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/9398248716.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/fudiselabap.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d85.bin
16b527db3d37861e4dacb2d928a2195327e55d971f798fbbfff806e3017b3a5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D85 5372 bytes
font_01_sfnt_off00005ffa.bin
8154c558a3af2b8d8f801d73d58a7733b21065973bfc79f29ce8d73ce0735fb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFA 7848 bytes
font_02_sfnt_off00007590.bin
4cc04b2cf88b48ed261f133ffcb453f3f185fa2217d1d8fcbce39c864b532ae7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7590 10336 bytes

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