Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a16995e1feda00…

MALICIOUS

PDF

43.3 KB Created: 2020-08-29 21:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c40b57f3b7a7a3eb0951b6e7b467c1a SHA-1: 66b48bce8a776315cc7588c6a391d2d762f2c0db SHA-256: 11a16995e1feda0078975f9bbfac3d13cf9b64f1b9e8ab72a58e322155ee99ba
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links to external PDF files, a technique often used for SEO manipulation or to host malicious content. One of the embedded URLs, 'https://ttraff.ru/wix?keyword=samuel+noah+kramer', is identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and other PDF links, suggesting an attempt to lure users or distribute further malicious 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=samuel+noah+kramer
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/87a178_13dc02e00a3b436eb8d7b31ae2b8dc48.pdf
    • https://static.usrfiles.com/ugd/b8c837_6109d0da593947988d5a3197125eb307.pdf
    • https://static.usrfiles.com/ugd/b8c837_6da2dc5df60c4aa28a00aed2239a116b.pdf
    • https://cdn.shopify.com/s/files/1/0433/9400/7201/files/wotakirafekaluvemube.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/capelania_empresarial.pdf
    • https://cdn.shopify.com/s/files/1/0441/0903/7720/files/51715646103.pdf
    • https://cdn.shopify.com/s/files/1/0437/8951/6958/files/28867946400.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/deep_learning_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1681/files/55062813924.pdf
    • https://cdn.shopify.com/s/files/1/0437/3974/2369/files/accp_chest_2018_guidelines.pdf
    • https://static.usrfiles.com/ugd/b8c837_efd06bd06baf434aa44f185218b28860.pdf
    • https://static.usrfiles.com/ugd/299074_7b7def9478674cbca6ed0a2dd5beb2a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc679750b13547dd99d7637bdc02d937.pdf
    • https://static.usrfiles.com/ugd/9734e7_eebc5fdf1f594c35918ca2e3e559e896.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060ad.bin
c6ccc0c87c56e1ec635509fe874b5f27285870d12a83ea8028032d54b79329b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60AD 4668 bytes
font_01_sfnt_off00007042.bin
8cbacc738ba66a19c9ffdecc0a2494e0a0c2d6cbe950b1fed96974ce533bdb2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7042 10076 bytes
font_02_sfnt_off00009288.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9288 4324 bytes

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