Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20483216d7fd95c…

MALICIOUS

PDF

45.7 KB Created: 2020-10-29 23:10:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce3ce7ba98c0cede3dbca5bfc4d8c3bc SHA-1: 7d0db5d459575737f89f7d76707dd9e92a7606d0 SHA-256: b20483216d7fd95c332992ddd0655b06526d5bcd2f2d1ae7ed05233b4758f8d6
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 numerous embedded links, many of which point to potentially malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically calls out the URL 'https://ttraff.ru/123?keyword=el+de+la+sabana+spanish+to+english' as a known malicious redirector. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute content through a link farm. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly suggest a malicious intent to redirect users.

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/123?keyword=el+de+la+sabana+spanish+to+english
    • https://cdn-cms.f-static.net/uploads/4369514/normal_5f890c5a052a9.pdf
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f91a152af6ea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0496/2874/1828/files/valence_electrons_and_ions_practice_worksheet_answers.pdf
    • https://s3.amazonaws.com/subud/83425650034.pdf
    • https://s3.amazonaws.com/xesigeze/kozolukos.pdf
    • https://cdn.shopify.com/s/files/1/0503/5222/6472/files/70193110684.pdf
    • https://uploads.strikinglycdn.com/files/e603774d-17bd-4830-a978-6d93a606d07c/gulaniwexuvexekupo.pdf
    • https://uploads.strikinglycdn.com/files/40089f05-c782-4358-9470-2a3afb24a51a/vonoji.pdf
    • https://uploads.strikinglycdn.com/files/71a5909d-b6b2-4863-9fb7-d251e2db3e2a/72687757499.pdf
    • https://cdn.shopify.com/s/files/1/0496/0072/5141/files/kalovumapejinumofedovuxo.pdf
    • https://uploads.strikinglycdn.com/files/44d47d1e-4513-4a00-adfe-2ceac17fd10a/sibinumerabinisa.pdf
    • https://cdn.shopify.com/s/files/1/0481/4690/7303/files/68423887892.pdf
    • https://s3.amazonaws.com/zetare/wizogijavexipogafi.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_off0000727a.bin
2c833a5b18ccd8d43f379b8b4547f97eb8adb2b6f0d7d53401c9610c6d5733ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x727A 5224 bytes
font_01_sfnt_off00008439.bin
d71c560582a1d8f569833c14eb57155d8277e62d1cf2e01a654e6b07eed0323d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8439 10996 bytes