Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a139570d5e589f…

MALICIOUS

PDF

53.8 KB Created: 2020-10-31 17:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10ff5d3b3d04b42d09660faf3eeeec0f SHA-1: 90e56b3d97039fc425383716777dea10abd45ca6 SHA-256: 05a139570d5e589f151dff3e3cdeabadd9bd86b68d2701d2b4b732b5d3ee7745
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector at 'https://cctraff.ru/strik?keyword=federalist+and+anti+federalist+worksheet'. The document's structure and embedded links suggest it is part of a link farm designed to drive traffic to malicious sites, likely for phishing or malware distribution. 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://cctraff.ru/strik?keyword=federalist+and+anti+federalist+worksheet
    • https://cdn-cms.f-static.net/uploads/4426060/normal_5f9acccd4cdd7.pdf
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/4967626.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/voxazedisula/1613039788.pdf
    • https://uploads.strikinglycdn.com/files/f559698c-1fd2-4022-8c79-50c87f0e4d91/nabidebodorejujumi.pdf
    • https://uploads.strikinglycdn.com/files/35a32da5-33f0-41ba-abc2-f0d7775b2e40/milady_chapter_25_manicuring_test_an.pdf
    • https://s3.amazonaws.com/nitirew/simaluvudene.pdf
    • https://s3.amazonaws.com/tejuvonixag/microsoft_excel_beginner_to_advanced_full_tutorial.pdf
    • https://uploads.strikinglycdn.com/files/90071c8f-2dab-4efa-83cd-2c24bd5ccd8f/kopufilarokamopu.pdf
    • https://uploads.strikinglycdn.com/files/70efc782-5797-48f1-8abc-bf9a29fb13a3/73409442657.pdf
    • https://uploads.strikinglycdn.com/files/5af4ca95-16f1-4e18-934b-6f7bf9f98c6d/grace_m_davis_high_school_bell_schedule.pdf
    • https://s3.amazonaws.com/mubefula/ffxiv_titan_extreme_tank_guide.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_off000093f9.bin
356531d270438783ea61b74b56036ace15d151689adb2612ce36d772aceb6648
pdf-font-stream PDF embedded font (sfnt) at offset 0x93F9 5104 bytes
font_01_sfnt_off0000a563.bin
937aabc8935d3299d69404a6896c81549ee48d9afdc29960ebb08bc8f7eb799c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA563 10744 bytes