Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fcc8c1cac36ac12…

MALICIOUS

PDF

47.5 KB Created: 2020-08-31 19:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b427e76c0fab58d16571aeb98a356ba SHA-1: a0e4cf48c9414f588f017fefc978b84d20a74055 SHA-256: 0fcc8c1cac36ac120fcfdfc567aee64734f5c2c53c99bb55080d31434726dce8
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lead users to further malicious content. The document body, though heavily obfuscated, contains text that suggests it is a test or answers document, likely a lure to encourage clicks. The presence of numerous external PDF links, many pointing to benign content, suggests a link farm or SEO poisoning attempt to mask the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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/wix?keyword=capitulo+6a+prueba+6a-+2+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/bf650e_f49e50fc5cea41049f986da9c301e685.pdf
    • https://static.usrfiles.com/ugd/b8c837_ddbe9f7b9f6d4273aa45a7eb0b4c2d32.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a3b37f170d244a4b7b7ee49d1f1d659.pdf
    • https://static.usrfiles.com/ugd/409ca8_b411b5db8ce841c09f9fc18c2fc3fed2.pdf
    • https://static.usrfiles.com/ugd/b8c837_304c82db875343c7814cc21b1dfc30bc.pdf
    • https://static.usrfiles.com/ugd/c068f8_54522a777d184767a7ba400cdcf8fe71.pdf
    • https://static.usrfiles.com/ugd/0d2908_4241764fe30e4017ab3eb3562714e20a.pdf
    • https://static.usrfiles.com/ugd/ab059d_ef1d2c52ceee481eb17de3fc884cc475.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_51da1885f32d4b1c8066a8049b094bab.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c20278505c14891a2e7a81577fb5f91.pdf
    • https://static.usrfiles.com/ugd/ae059d_8f14f63075ba4f49a3d56bfce889f0cb.pdf
    • https://static.usrfiles.com/ugd/ceb2e8_950598c393324de3b23f7cebce3b40ef.pdf
    • https://static.usrfiles.com/ugd/15cd4d_c4708527f04340e3befbe1e3fffefe91.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_off00007a73.bin
51c5eae1ba2fb7101c308efea2ca9b22a6a8c29a26c6c7d6608b1fed2cfacdcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A73 5268 bytes
font_01_sfnt_off00008c77.bin
abf27e1be05bdee7512cd0639c19cd80e2f1f81d2c6b302ab61d8dcca18cda32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C77 10776 bytes

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