Malicious PDF — malware analysis report

Static analysis result for SHA-256 6797716e2257ca78…

MALICIOUS

PDF

42.2 KB Created: 2020-08-24 11:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81b23de1c931831b085f0ec0ae16885b SHA-1: 40cc484803ae7e3fa4bd6ff0ea48e30724471ead SHA-256: 6797716e2257ca78de14d7daa21ca366fbbf6cb5650d81de90c6e08f586c7e70
154 Risk Score

Malware Insights

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

This PDF document functions as a link farm, presenting a lure of an 'Online json formatter to string' while embedding numerous links to external PDF files. One of these links, https://ttraff.com/pify?keyword=online+json+formatter+to+string, is identified as a malicious redirector. The document's primary purpose appears to be directing users to potentially harmful websites through this deceptive link structure.

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=online+json+formatter+to+string
    • http://files.kidstocktheater.com/uploads/1/3/1/8/131871586/vopezijemomul_wazukuzutim_xiwixudozo.pdf
    • http://zirobida.thenaturals.com/uploads/1/3/1/1/131164250/ec9fe36.pdf
    • http://wujon.milfordmagic.com/uploads/1/3/0/8/130814328/5478509.pdf
    • http://files.mobileperformancetherapy.com/uploads/1/3/1/3/131379181/981b00b9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/5844/4958/files/23465397639.pdf
    • https://cdn.shopify.com/s/files/1/0433/2499/7800/files/33771057687.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/anestesia_epidural_contraindicaciones.pdf
    • https://cdn.shopify.com/s/files/1/0437/0087/9510/files/74277991537.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/59695743486.pdf
    • https://cdn.shopify.com/s/files/1/0432/8233/3856/files/serenade_schubert_liszt.pdf
    • https://cdn.shopify.com/s/files/1/0428/7207/8499/files/94354381855.pdf
    • https://cdn.shopify.com/s/files/1/0436/1378/2173/files/28269585604.pdf
    • https://cdn.shopify.com/s/files/1/0429/1205/5463/files/64919078984.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_off0000646b.bin
87b9688b800c06bb40fe7060ceb113e5f469120bb36ae674369c45168fde9f47
pdf-font-stream PDF embedded font (sfnt) at offset 0x646B 5192 bytes
font_01_sfnt_off00007601.bin
4431c82873ca1bc645afc7958b414c31274ae0ce2678dd5bc685d000437734dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7601 11304 bytes