Malicious PDF — malware analysis report

Static analysis result for SHA-256 619755d8ff4f3f7a…

MALICIOUS

PDF

34.8 KB Created: 2020-08-18 13:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a56b7e2a83bb1f9aac2fbe2c2c0ead6 SHA-1: 5a6f91c0d3eea21bed72a90595ab39b16bdedc2a SHA-256: 619755d8ff4f3f7ae128902ef79681630a60006e320efb4920350e55dae49629
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document also features a large number of external PDF links, suggesting a link farm for SEO manipulation or to distribute further malicious content. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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=balettan+movie+songs
    • http://koketel.naturaphysicaltherapy.org/uploads/1/3/2/3/132303382/c69703905a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/english_language_teaching_approaches_methods_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0434/6124/7129/files/medupawidogukabew.pdf
    • https://cdn.shopify.com/s/files/1/0431/6086/2882/files/ratasumutexaxevemukilej.pdf
    • https://cdn.shopify.com/s/files/1/0431/2432/6564/files/the_astonishing_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0435/1072/6815/files/duvasigoj.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/98194065158.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1025/files/aula_internacional_1_nueva_edicion_libro_del_alumno_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0438/1769/7437/files/charamsukh_episode_6_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/9012/4708/files/bvvjdp_exam_time_table_2019.pdf
    • https://cdn.shopify.com/s/files/1/0433/0605/7888/files/bexufulurafenavosawawaxo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/vimereforawaposunepal.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_off00004bfb.bin
15fcb63968605449304b8a5b3834b15e92e67ac7778cdb23fe332f6a464c6ba7
pdf-font-stream PDF embedded font (sfnt) at offset 0x4BFB 5020 bytes
font_01_sfnt_off00005d08.bin
7c964ca357bbc80199605a273c127f19fdc1406de35861feafe051482eabb90b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D08 9904 bytes