Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e3b81b238a861e1…

MALICIOUS

PDF

47.9 KB Created: 2020-08-27 23:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e54ec66720c610980969d5463b145df SHA-1: 9e871bb132582a5fa2afa2f9aafc26c77fd23dcd SHA-256: 0e3b81b238a861e105753a95bb8b20335c7fc89e517b0b756c64b816ef6d1255
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to funnel victims to further malicious content. The document body, though heavily obfuscated, contains this URL and appears to be a lure for educational material. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm intended to improve SEO for 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.com/pify?keyword=secuencias+temporales+para+ni%25C3%25B1os+pdf
    • http://nogal.patricialino.com/uploads/1/3/0/7/130739777/402352.pdf
    • http://tomov.liongrads.com/uploads/1/3/1/3/131383483/kutid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/96177261695.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/fodekatotutide.pdf
    • https://cdn.shopify.com/s/files/1/0434/0868/7269/files/6764318499.pdf
    • https://cdn.shopify.com/s/files/1/0434/9696/4261/files/87831593827.pdf
    • https://cdn.shopify.com/s/files/1/0431/5411/2672/files/dexavabofatisotujob.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/74003743359.pdf
    • https://cdn.shopify.com/s/files/1/0429/3502/5831/files/78463724504.pdf
    • https://cdn.shopify.com/s/files/1/0429/9164/8929/files/tanatologia_cristiana.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4665/files/fekuki.pdf
    • https://cdn.shopify.com/s/files/1/0440/3465/4358/files/bland_diet_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0429/5534/1977/files/76927305732.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/83583068491.pdf
    • https://cdn.shopify.com/s/files/1/0435/4503/4911/files/37067825017.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_off00006466.bin
0b58e18220e4f9c187a40069984a9e3632b50f7103d91e947509c1d577fb98b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6466 5616 bytes
font_01_sfnt_off0000771a.bin
858eb9d7f4876602f3e9974860b7fb67d6dcbaab6e8785e50f808b6658af0866		 pdf-font-stream PDF embedded font (sfnt) at offset 0x771A 11180 bytes
font_02_sfnt_off00009b89.bin
160a156ea896e4b5f058735de66997a4342b38ce6e8cba643e0512fb9cd539f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B89 16124 bytes

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