Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9da4fa49cb0c894…

MALICIOUS

PDF

112.9 KB Created: 2020-11-01 18:25:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f8e5c87852b8890e680f34166e6f80d9 SHA-1: 1e2cbb0663287e16e317a19b3651982ee8cc2f24 SHA-256: e9da4fa49cb0c89419b9dad07057decf2239477bfa88fd7ab7c990ac63daeac3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a malicious domain, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. It also functions as a link farm, directing users to numerous other PDF files hosted on disposable domains, as indicated by 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector and link farm attack pattern.

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.cc/123?keyword=cursive+writing+practice+sheets In PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/rarosaj_lemepagega.pdfIn PDF document text
    • https://gimelukisisira.weebly.com/uploads/1/3/4/0/134040832/tewotigogu-zofajiweruvefe-resuvuxalejek-melivoxuxa.pdfIn PDF document text
    • https://xigokerurubupa.weebly.com/uploads/1/3/4/3/134312623/4811962.pdfIn PDF document text
    • https://kudizuvawemexol.weebly.com/uploads/1/3/4/3/134307781/5570451.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/kadupe_ripovu_jozovagazemewe.pdfIn PDF document text
    • https://wilofera.weebly.com/uploads/1/3/4/4/134488721/lesuv.pdfIn PDF document text
    • https://dolevepi.weebly.com/uploads/1/3/4/5/134587457/5c6aa3541d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3bbc7b3-ee61-455e-b957-b14c34060de8/silikeneso.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/natija.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/sound_world_solutions_cs50_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe5c1bb-3c96-4f2a-815a-3a2e2a867811/printable_weight_lifting_max_percentage_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e04e3e0-609c-4901-b0b8-d56712289575/ana_mae_barbosa.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/36126862776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63215567-3ecf-429e-94bb-2cd2cb76f46f/makovewolaresu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/323b18db-7dbf-464c-9914-6b65e6ff427c/xofetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4844dc87-a60a-428a-8125-72fe94b00d46/28672091178.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_off00016e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E45 3200 bytes
SHA-256: a10458568313899c1307c4fb4a7ec9693dc1a81f0bf58184c24fdd267e2c7dfb
font_01_sfnt_off000179c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179C6 5220 bytes
SHA-256: f392da7e0c456fe703dadf277b20ffe6ea89eed3b45be2ccd28f061ce36ee051
font_02_sfnt_off00018b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B9A 12980 bytes
SHA-256: 04b2e7edf625df66487bbb93a49bcbdee2ee88010a23cd2b5d7d44c556528092

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