Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c5ca611d7aa3f7…

MALICIOUS

PDF

55.1 KB Created: 2020-11-08 07:58:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5541b83e22e9f32717e346424110c85b SHA-1: 9d06584035b79c06305e1f322b0a5ad4f8922690 SHA-256: 24c5ca611d7aa3f71c08388496bf5a90b311968d5f9a25da85efdee7e381a65e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable hosting services, indicating a link farm designed to distribute traffic. One of these links, 'https://traffmen.ru/123?keyword=tempered+kushala+daora+guide', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of URLs suggests an attempt to lure users to malicious sites.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/123?keyword=tempered+kushala+daora+guide In PDF document text
    • https://wekijoborumotis.weebly.com/uploads/1/3/4/4/134484899/2e999d82e727ac0.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/0d3adddcc90.pdfIn PDF document text
    • https://lumixiwutetus.weebly.com/uploads/1/3/4/3/134388296/1730522.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/9607847.pdfIn PDF document text
    • https://tufelovewojamex.weebly.com/uploads/1/3/4/3/134331554/ropezowofaxiro_gorezovamev_vabulexax_zonuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_5fa492e9e3f99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418567/normal_5f9769e262b37.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/velivebofagimavo.pdfIn PDF document text
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/falitaterajozesowus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://rititome.files.wordpress.com/2020/11/11292392141.pdfIn PDF document text
    • https://nimiforaxub.files.wordpress.com/2020/11/f76_ge_oven.pdfIn PDF document text
    • https://mivepir.files.wordpress.com/2020/11/gba_pokemon_black_and_white_rom.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D5 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off00007498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7498 4108 bytes
SHA-256: e3aa1b451ccac6968e7c60fbf73f1e91df72dd2c2786e98c99ead52698cac361
font_02_sfnt_off000082fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82FE 5388 bytes
SHA-256: d6b2120efb9f75670011ef49ddf5d4476507df3e0578d3afb3ff08cb90e6180b
font_03_sfnt_off00009520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9520 10460 bytes
SHA-256: 726c855716d17466cced43c0b99e5a857fff343321743e1e01964c41761406d5
font_04_sfnt_off0000b945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB945 16160 bytes
SHA-256: 89b377872ea6d3aab5fb89e918f6000d53c926b8a03a903ff29ca99b36412fcd