Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a5976b7e807d00…

MALICIOUS

PDF

53.3 KB Created: 2020-08-18 22:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d396bc73dd09607de99923661094784 SHA-1: eb6ddd2c719ebf3cc60c93665c37bfd54d9d4b08 SHA-256: 10a5976b7e807d0066ebae7f0f904fcc0fc88b171f9c459e2c77c7719526c011
162 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text that appears to be a lure for 'Assault cube linux' and includes the malicious URL. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to distribute the malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=assault+cube+linux
    • http://jinerux.alquintaforestgarden.com/uploads/1/3/2/7/132712326/movixobuduf-lugopetudefax.pdf
    • http://files.dustincurtismemorialscholarship.org/uploads/1/3/0/8/130873918/sujukeki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/fupimefelu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0219/files/88884249625.pdf
    • https://cdn.shopify.com/s/files/1/0430/8353/0394/files/chaupai_sahib_path_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0436/8809/9993/files/html_to_converter_c_open_source.pdf
    • https://cdn.shopify.com/s/files/1/0433/6638/3770/files/ridukodurexogutosazuwuku.pdf
    • https://cdn.shopify.com/s/files/1/0447/9369/2326/files/differential_calculus_and_integral_calculus.pdf
    • https://cdn.shopify.com/s/files/1/0431/4133/3147/files/60585430351.pdf
    • https://cdn.shopify.com/s/files/1/0437/1356/0727/files/75136518447.pdf
    • https://cdn.shopify.com/s/files/1/0433/8876/4316/files/saxon_algebra_1.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/44929183717.pdf
    • https://cdn.shopify.com/s/files/1/0439/8543/6830/files/vivaba.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072ec.bin
a4c35a9694dc431ef6113db66cb13a7d335862393d0d35d5adb22cbbb5e8fe75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72EC 4668 bytes
font_01_sfnt_off000082cf.bin
ca97ac6469eaef2a645060166aa86507119e82fef6df036f6684168262bdb0d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82CF 10128 bytes
font_02_sfnt_off0000a5a3.bin
ba49a359edda73fb432b2118eee43e8681603f6c6f845ef214af08c3a95321db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5A3 16088 bytes
font_03_sfnt_off0000ba63.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA63 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.