Malicious PDF — malware analysis report

Static analysis result for SHA-256 1293a58efa6dd102…

MALICIOUS

PDF

42.2 KB Created: 2020-08-07 01:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 990f2b9101a3116f8992efdd346d564a SHA-1: 27d8ba6e904ac31ce72dfc3fab96ebd674092f08 SHA-256: 1293a58efa6dd1028a91872d2e178b03e31b8c6fa53a0050ba69e89458bdc72c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many pointing to external PDF files, a tactic often used for SEO manipulation or to host malicious content. One critical heuristic identified a link to a known malicious redirector, traff.cc, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains text related to 'advanced excel tutorial free pdf' and the malicious redirector URL, suggesting a lure to trick users into clicking the link.

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.cc/pify?keyword=advanced+excel+tutorial+free+pdf
    • http://files.placeworksdesign.com/uploads/1/3/1/3/131380889/lesafumisagokewu.pdf
    • http://files.dropintoinfinity.com/uploads/1/3/2/7/132710748/1554800.pdf
    • http://files.washington-scottish.com/uploads/1/3/0/8/130874318/8b0f395751b7b3.pdf
    • http://files.deepcutfilm.com/uploads/1/3/0/8/130873893/f9f1234c193.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0443/0757/9036/files/abstract_reasoning_test_2.pdf
    • https://cdn.shopify.com/s/files/1/0429/9263/1962/files/taxepo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5541/5445/files/learning_of_ms_excel.pdf
    • https://cdn.shopify.com/s/files/1/0437/3679/3237/files/18209078192.pdf
    • https://cdn.shopify.com/s/files/1/0428/5222/1091/files/woralilivan.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/48643379492.pdf
    • https://cdn.shopify.com/s/files/1/0431/6318/9405/files/tiburudasifodubedilikonup.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1560/files/nimeniwesulagadebajinuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/2239/3244/files/94240281985.pdf
    • https://cdn.shopify.com/s/files/1/0429/3243/7158/files/bomiziponowegiso.pdf
    • https://cdn.shopify.com/s/files/1/0431/6371/3695/files/84729655376.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6837/files/el_caballo_de_troya_3.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_off00006763.bin
8a50ff589a1bcd2b9a5c3e94a8dbd67b767147d89c08e5bc1bdcb403f167f050		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6763 5088 bytes
font_01_sfnt_off000078d1.bin
9345197cc670b394d5b78a0628b34ed3471f8c283ed7280bf7f612766b76b6ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D1 10304 bytes

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