Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e738bca7545398…

MALICIOUS

PDF

42.2 KB Created: 2020-08-31 11:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b7e35f24cdd9a1940dacac541c77d62 SHA-1: 65714daebf3c6e88488b485d7e530e674c741318 SHA-256: 66e738bca7545398926a4331f831a7b3991591f0d4d05f4278356bfab69ce746
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.ru/wix. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external PDF links, with the first being https://static.usrfiles.com/ugd/7baf93_764fb212497e436f8105fe08cc6bb735.pdf. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to trick users into visiting potentially harmful content.

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=O+QUE+%25C3%2589+COMET%25C3%2589+CENTRAL+GUIAESTUDO
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/7baf93_764fb212497e436f8105fe08cc6bb735.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2f97d989bce4ff79a7d7a2b7692f33d.pdf
    • https://static.usrfiles.com/ugd/74a852_2c20b9d7a6bd45b8b7a9508851e4b727.pdf
    • https://static.usrfiles.com/ugd/b8c837_896367473ce44bd59dd3671ef063cd83.pdf
    • https://static.usrfiles.com/ugd/6a7407_a739e0a5cf2e4cfc8b3aa72d232eceb6.pdf
    • https://cdn.shopify.com/s/files/1/0429/8178/5753/files/economic_effects_of_rural_urban_migration.pdf
    • https://static.usrfiles.com/ugd/353d00_62240b0c46f8470c9c85ba0ad776df5c.pdf
    • https://static.usrfiles.com/ugd/1e32c2_fd608bdbf9464c9e9ca719e7f47cc511.pdf
    • https://static.usrfiles.com/ugd/0a593f_e97f03d4bb6d4d3bb5c532d78d9da9d3.pdf
    • https://static.usrfiles.com/ugd/9ea91e_434ac05dcd9c4068bb29c50115ed9b50.pdf
    • https://static.usrfiles.com/ugd/81d6a4_f8f5c16d4fe846b58bad9dd8c2d8d98b.pdf
    • https://cdn.shopify.com/s/files/1/0432/2725/0848/files/pathfinder_blood_of_the_sea.pdf
    • https://cdn.shopify.com/s/files/1/0437/4321/5767/files/70916175764.pdf
    • https://cdn.shopify.com/s/files/1/0433/2797/9678/files/mitewadesamadeguzofuvojol.pdf
    • https://cdn.shopify.com/s/files/1/0430/1907/5737/files/54979295615.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_off0000610a.bin
cbcfb7ffbac79cb32690af6fb27927d501ac35d09ee25d7a4197571a2a4518f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x610A 5440 bytes
font_01_sfnt_off00007384.bin
727e27be79051945866de80386e5f931735d17a2dd62bc6c78c3f22f9333a9bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7384 13060 bytes

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