Malicious PDF — malware analysis report

Static analysis result for SHA-256 83975deb2d2b3ef0…

MALICIOUS

PDF

142.2 KB Created: 2020-08-31 12:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b23a8df900fc709a0097a6324ee2ddf SHA-1: c21b995856f13b7c10868f33e9b5387f55935633 SHA-256: 83975deb2d2b3ef07ff1a1a2d6d245fc6456e94420f6485eb960b0e467aeafbc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged as malicious due to its inclusion of a link farm pointing to known malicious redirector infrastructure. The primary malicious URL identified is 'https://ttraff.ru/wix?keyword=mta+bus+jfk+depot'. The document body, though heavily obfuscated, contains references to this URL. The presence of numerous external PDF links, many hosted on Shopify, suggests an attempt to obscure the final malicious destination and potentially leverage SEO techniques for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=mta+bus+jfk+depot
    • https://cdn.shopify.com/s/files/1/0435/7308/4319/files/holy_aura_5e.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3032/files/28384206106.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5812/files/git_replace_local_file_with_remote.pdf
    • https://cdn.shopify.com/s/files/1/0435/0948/1626/files/sadudazamaros.pdf
    • https://static.usrfiles.com/ugd/b8c837_c84048ecc36e4063b4268c359c680b16.pdf
    • https://static.usrfiles.com/ugd/6116da_399cfa053e074334b8f883c3ec87ba4e.pdf
    • https://static.usrfiles.com/ugd/5a1791_367c0584760247958224701630a48a97.pdf
    • https://static.usrfiles.com/ugd/738632_2570d6462486443ea0a2f8a744fe23f6.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_cf2da0ab2e204cb98c338e3af7e08b7f.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f1b0.bin
151fc0be01fe4d3cbcd27237a4c6309c72943ddb7f600ec58f3a4c67e65d3fa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1B0 5192 bytes
font_01_sfnt_off00020382.bin
6a1a4210d503cd35b2cea809f3271b717b3b168bcd4a34a5ffd7040077f0ce70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20382 12132 bytes

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