Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b090a14088bcd60…

MALICIOUS

PDF

54.4 KB Created: 2020-10-26 05:24:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c74c2a4b113d5ef089dc6c66fb836015 SHA-1: ece6b62625f8d29647a23d51272fe5e65554b382 SHA-256: 3b090a14088bcd60a93e88339a795d78f9d7d11ebc8fa33dd586b64b74214361
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 of which point to disposable hosting services and redirector infrastructure, indicating a link farm designed to lure users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link further supports a malicious intent. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

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.me/123?keyword=braun+thermoscan+manual+type+6013 In PDF document text
    • https://fobopogukigu.weebly.com/uploads/1/3/4/3/134366855/b023e63521ff2.pdfIn PDF document text
    • https://labajilawuja.weebly.com/uploads/1/3/1/4/131406369/fakemozu-wevebamaj-potimox-remosag.pdfIn PDF document text
    • https://posodukur.weebly.com/uploads/1/3/4/3/134347560/f8e818d739.pdfIn PDF document text
    • https://zuxuzesis.weebly.com/uploads/1/3/1/4/131438019/mokodet_jumisimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382194/normal_5f95344f9433a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_5f8e28d89d0f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f962d9c9eec2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5f895c48d33b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401518/normal_5f91d258b80ce.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/suzip_variguresigepom_vukulubilupowe.pdfIn PDF document text
    • https://sidunaxegizu.weebly.com/uploads/1/3/0/7/130776644/5067870.pdfIn PDF document text
    • https://nupureforisuro.weebly.com/uploads/1/3/4/3/134353583/5348dd26e5f.pdfIn PDF document text
    • https://lekolusogi.weebly.com/uploads/1/3/4/3/134365603/07e041b.pdfIn PDF document text
    • https://dudikojegak.weebly.com/uploads/1/3/1/4/131406444/18a9ef.pdfIn PDF document text
    • https://jirewolekaza.weebly.com/uploads/1/3/4/3/134387643/9443856.pdfIn PDF document text
    • https://leruzifu.weebly.com/uploads/1/3/2/3/132302941/34642.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://uploads.strikinglycdn.com/files/9ec8d4d3-2bf8-436f-81f5-4d24ead60873/94377031470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8b88770-b6fe-43bc-853b-4bae8b0df9f9/comentario_de_texto_adecuacion_coher.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2060/5850/files/33_the_series_volume_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/7534/6847/files/53551992560.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_off00008313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8313 5668 bytes
SHA-256: 4d00508c4d66ef788a3083fdac82cf3f2cfc00b787f65a9cbe5e71401ae5c68e
font_01_sfnt_off00009633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9633 11320 bytes
SHA-256: 7e90ef8e4d1de99f2422cc135be2d41d391ef3c7668981326cdce4b1711a3e16
font_02_sfnt_off0000bcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB0 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333