Malicious PDF — malware analysis report

Static analysis result for SHA-256 fead2b2a53ba5961…

MALICIOUS

PDF

60.1 KB Created: 2020-10-14 17:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3e71bc468f474516a5d5f4c033dcef14 SHA-1: b260424dd334d7c46f7c326903fc3bc5dc265934 SHA-256: fead2b2a53ba5961eb11199fe7f21753ecd1352addbd04ec70c7b4649a2360ef
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting the document is designed to lead users to harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

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://cctraff.ru/strik?keyword=australia+map+blank+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5f86f6635cac4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f86feb02de7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5f870d94ea799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5f86f83272334.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f86f96b3295d.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/tidivobinimigip-banez-batipafon.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/kizerapu.pdfIn PDF document text
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/tigosorivibisakoxu.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/6431815.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/mofep.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/lulodegoner.pdfIn PDF document text
    • https://site-1043668.mozfiles.com/files/1043668/25420913094.pdfIn PDF document text
    • https://site-1040208.mozfiles.com/files/1040208/kavekaliwivudugalu.pdfIn PDF document text
    • https://site-1042770.mozfiles.com/files/1042770/27801811788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f86f82a6bac2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f8703b33de70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5f870bba5032c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f86f4a015768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8393/2582/files/classical_guitar_songs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4196/2649/files/pobisonipa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5943/6968/files/blower_motor_furnace_buzzing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9788/2773/files/23013917423.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7831/0295/files/romeo_and_juliet_act_1_practice_test.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA083 5032 bytes
SHA-256: 3f4a16bdb044f29e59d94486384d800c5754f6f4012dd993c7252ef20458fada
font_01_sfnt_off0000b167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB167 10264 bytes
SHA-256: b94c05dd31c22ab4ba7635318ac97b586129e5852262d0402b1104ec548b4671
font_02_sfnt_off0000d48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361