Malicious PDF — malware analysis report

Static analysis result for SHA-256 1275069d30988ba2…

MALICIOUS

PDF

47.6 KB Created: 2020-08-18 23:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9086374d4b11d84fd5fd3b5595d9e2fd SHA-1: 9984dabe3276bfbdc18011b35d71ad5bb3d54912 SHA-256: 1275069d30988ba21add94c5293af13f28669755d159ac1d86ffec0177a044ee
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.com/pify?keyword=simplifying+rational+expressions+with+fractional+exponents+worksheet. The document body, though heavily obfuscated, also contains this URL, indicating its primary purpose is to redirect users to 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.com/pify?keyword=simplifying+rational+expressions+with+fractional+exponents+worksheet
    • http://files.kodiaklions.org/uploads/1/3/0/8/130874478/nomitetonaxu.pdf
    • http://nuwovan.igor-popov.com/uploads/1/3/2/6/132695213/jodosixinozo-zitar-tewirusiw-ninaxiraja.pdf
    • http://soxavig.francesharriet.com/uploads/1/3/1/4/131406082/vadogaluxoxiwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0936/6427/files/disable_remote_desktop.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/kedijabasanojilovisasa.pdf
    • https://cdn.shopify.com/s/files/1/0441/4432/8856/files/47058695042.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/9090740429.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bekikelazipilexujewa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8992/files/54751639049.pdf
    • https://cdn.shopify.com/s/files/1/0437/2047/4779/files/dnd_5e_mystic.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1674/files/74494134996.pdf
    • https://cdn.shopify.com/s/files/1/0440/0994/7301/files/39897336500.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c32.bin
2b95a60a3de6d1d83b3f9fd93284a28b3c2c798d8b532d28e860883112090c26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C32 5860 bytes
font_01_sfnt_off00007010.bin
84c8bfa1634df5ce8fa0881ce0ed94befce91812966569a49bf477b850417082		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7010 13172 bytes
font_02_sfnt_off00009995.bin
b10e7a0583bf6b216a5471aeed10f14210f1dda3adb60ac5169fcb38ba12e60c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9995 16060 bytes

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