Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a5f5c51b0415d2…

MALICIOUS

PDF

35.4 KB Created: 2020-08-31 08:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cd6bffca990a2d2d236c0e714d56b60 SHA-1: 543dc7db869346733ae256f62fb45bd7a6c75f63 SHA-256: 76a5f5c51b0415d21f1a8515a81b3948cc74e9aa43c2aac7bd17e1648b5b623f
102 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 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of PDF redirects often involves JavaScript to facilitate the redirection.

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.
  • 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=possessive+pronoun+and+possessive+adjective+exercise
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6148/4437/files/mp4_test_videos.pdf
    • https://cdn.shopify.com/s/files/1/0436/3635/9326/files/riguzaranokikerodibu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3813/8783/files/27352391675.pdf
    • https://cdn.shopify.com/s/files/1/0469/9317/8776/files/joseph_john_thomson_atome.pdf
    • https://static.usrfiles.com/ugd/2f7815_3bdb4516a3444d6b91242e55b92d2224.pdf
    • https://static.usrfiles.com/ugd/77d535_99bb51b4c8bc4f7bb944f28a28ca4ad8.pdf
    • https://cdn.shopify.com/s/files/1/0432/0716/4064/files/comic_layout_template_psd.pdf
    • https://cdn.shopify.com/s/files/1/0435/6826/7423/files/kalenusefugurarob.pdf
    • https://cdn.shopify.com/s/files/1/0431/9536/7585/files/dividends_shown_on_balance_sheet.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_off000046cd.bin
b56a667c3d195dc0a06ad30dc094f5c5675e2e5c0b17274cb781dc5285dda819		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46CD 5240 bytes
font_01_sfnt_off000058ba.bin
fd2eb2ca990cd98a2d9188a0cb3dfbae14c4b88f11d3b015ca4bb80249b0d27b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58BA 12704 bytes

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