Malicious PDF — malware analysis report

Static analysis result for SHA-256 7309d89adf96df15…

MALICIOUS

PDF

50.9 KB Created: 2020-08-08 22:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c8b76817eded652bcccbda88ccb6487 SHA-1: e4e96fc1a1280dee8660a0c9f03efb78fd46c7ff SHA-256: 7309d89adf96df159f1251bc565ff9b442994edd940258636c6d1c12d77c31e3
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 manipulation tactic. One of the primary links, 'https://ttraff.ru/pify?keyword=statistical+inference+for+stochastic+processes+pdf', is flagged as a known malicious redirector. The document body itself is heavily obfuscated but contains references to the malicious URL and other benign-looking Shopify URLs, likely to mask the malicious intent. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=statistical+inference+for+stochastic+processes+pdf
    • http://files.literacyandbeyond.org/uploads/1/3/1/3/131398195/fofesozub_kinaxexede_kexugugozipam_bizelumaxo.pdf
    • http://files.chamisachocolate.com/uploads/1/3/2/6/132695428/6052314.pdf
    • http://lowero.ochrestudio.com/uploads/1/3/1/3/131398140/c86aa65e191b8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4078/5062/files/download_agama_islam_kelas_12_kurikulum_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/1945/3095/files/nukaxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4693/files/66706219209.pdf
    • https://cdn.shopify.com/s/files/1/0431/6332/0469/files/ranutexu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9228/6363/files/losage.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1126/files/najuvanorumafina.pdf
    • https://cdn.shopify.com/s/files/1/0431/6610/5759/files/pefevevidomutuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/4252/0739/files/29157012874.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2339/files/5384573835.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_off00006a26.bin
459f8a8c702d3a71c5f96cc43420acd1c71e6fb6d148650cf3fd0b42c64894e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A26 5344 bytes
font_01_sfnt_off00007c48.bin
a2ebf72a3a2b81059320315c0c18c5fb74055d03524a08b8bf75084970ccb321		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C48 14132 bytes
font_02_sfnt_off0000a953.bin
192e1cf8743c95d644f41697cb32af4f2bd92b7888e96aef7f61385a8dcfe722		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA953 16084 bytes

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