Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c01dcd8eb64eda…

MALICIOUS

PDF

39.7 KB Created: 2020-08-16 14:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e80778daa1813edfd6f2763ec1827496 SHA-1: d7747b7a41e88917247498fadb36d7a7f007f89c SHA-256: 72c01dcd8eb64eda5e4eafda8f109a4672bd87fd6024f1bba852cd9448686447
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, masquerading as an academic resource link farm, but one of the primary links directs to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure itself is suspicious due to the mass of external links. The document body is heavily obfuscated and contains a reference to the malicious URL.

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.com/pify?keyword=bodbot+pro+apk
    • http://kepumuku.westfieldkennels.co.nz/uploads/1/3/0/7/130738731/burivijetirapu_wuseluf_mizefitux_kufemipip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4319/1969/files/fundamentals_of_transportation_engineering_fricker.pdf
    • https://cdn.shopify.com/s/files/1/0431/0279/7986/files/92280972906.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/veer_bahadur_singh_purvanchal_university_jaunpur_time_table_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87664315042.pdf
    • https://cdn.shopify.com/s/files/1/0430/0128/2711/files/69649048839.pdf
    • https://cdn.shopify.com/s/files/1/0439/1885/2264/files/problem_solving_strategies_arthur_engel.pdf
    • https://cdn.shopify.com/s/files/1/0430/6714/6397/files/vepigefoxutemaputaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/4874/7676/files/28523722700.pdf
    • https://cdn.shopify.com/s/files/1/0436/6984/8217/files/77314335553.pdf
    • https://cdn.shopify.com/s/files/1/0429/5553/8591/files/romasibovalatatiwof.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_off0000601f.bin
da60e4e246053b292c68d0bf9470038df54b5faa94359f80f9d12b3c93ddf700
pdf-font-stream PDF embedded font (sfnt) at offset 0x601F 4996 bytes
font_01_sfnt_off0000712a.bin
d0b574d4f3fda31085aa25dc8c4b5d0430aa1217935eae3296a15e892e43c1c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x712A 9880 bytes