Malicious PDF — malware analysis report

Static analysis result for SHA-256 191445d3e27f8bdf…

MALICIOUS

PDF

40.1 KB Created: 2020-10-15 08:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 75e9e0467048e615d9713827f51f62ac SHA-1: 683fee40835de4a57b5846ab701b55272d624017 SHA-256: 191445d3e27f8bdfe6674ff717d3b272376812930cce46fba2ec75d8325feaaa
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious due to its function as a link farm. It contains numerous embedded URLs, including a redirector link to 'ttraff.club', which is flagged as malicious. The document body, though heavily obfuscated, also contains references to these URLs, suggesting an intent to lead users to external, potentially harmful content. The ML classifier strongly supported the malicious verdict.

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://ttraff.club/pify?keyword=radion+xr30w+gen+3+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f8721f7afefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5f86f86048e8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5f875cc0afd95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5f87c1a5d0ad6.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/93049f265a0000.pdfIn PDF document text
    • https://site-1041676.mozfiles.com/files/1041676/98152407720.pdfIn PDF document text
    • https://site-1036632.mozfiles.com/files/1036632/10834822237.pdfIn PDF document text
    • https://site-1043337.mozfiles.com/files/1043337/kisolojenori.pdfIn PDF document text
    • https://site-1042937.mozfiles.com/files/1042937/poultry_farming_project_plan.pdfIn PDF document text
    • https://site-1037903.mozfiles.com/files/1037903/dumixezimu.pdfIn PDF document text
    • https://seririgikum.weebly.com/uploads/1/3/0/7/130739922/6357c92.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/1414262.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/pabajab-xujojet-dizuk.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rugatu-rugot.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/d8065cd0ebc23d.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/6578987.pdfIn PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/4230817.pdfIn PDF document text
    • https://pobezewimo.weebly.com/uploads/1/3/2/6/132681951/duguweleda.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/velowo_dakemolaku.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/xewuj.pdfIn PDF document text
    • https://wonigebegi.weebly.com/uploads/1/3/1/6/131606731/54c86654.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/cd3619fef1.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/7c2eb3c.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
    • 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_off000050c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50C6 5244 bytes
SHA-256: 7cbbf1383ef7a4d372fb6eebc451e644e8afc278fe9d8e96c4dc897ea13a8b80
font_01_sfnt_off0000628b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x628B 10092 bytes
SHA-256: 10f7ba596c78baf22f2c5d6d39768acf2ced40d43fe9203bac257ebbe755cf2e
font_02_sfnt_off0000850d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x850D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361