PDF malware analysis — malicious · 4e08af061e1a5fab

MALICIOUS

PDF

42.7 KB Created: 2020-10-15 15:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23

MD5: c214acaaa3bb8b6a6df71414e236978b SHA-1: b4e40cb04deec023a1e111bfaadbff371eb669cf SHA-256: 4e08af061e1a5fabc15c6c12af4704bb7cdcb2877b319121b52a96f8e902cfee

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a significant number of embedded URLs, many of which point to disposable hosting services and are likely part of a link farm. One URL, 'https://ggtraff.ru/123?keyword=embolie+pulmonaire+ecg+pdf', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the embedded links suggests a malicious intent, possibly for SEO manipulation or to redirect users to phishing or malware sites.

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://ggtraff.ru/123?keyword=embolie+pulmonaire+ecg+pdf In PDF document text
- https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/pejajofedaxevaw_kozadesupuke.pdfIn PDF document text
- https://wonigebegi.weebly.com/uploads/1/3/1/6/131606731/wasonomibirobe.pdfIn PDF document text
- https://biwugina.weebly.com/uploads/1/3/1/1/131163984/7417167.pdfIn PDF document text
- https://fadusoga.weebly.com/uploads/1/3/0/7/130739873/c2e2df821.pdfIn PDF document text
- https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/9b328ad073f8f.pdfIn PDF document text
- https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/04609804.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4368224/normal_5f87c49c60dea.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4365662/normal_5f87395d2ab42.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4365653/normal_5f87b3422dad1.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366652/normal_5f873d4302a9d.pdfIn PDF document text
- https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/e375071c24.pdfIn PDF document text
- https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/40ddfa4d7f4e3e.pdfIn PDF document text
- https://vozutadisifik.weebly.com/uploads/1/3/1/4/131483249/9186477.pdfIn PDF document text
- https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/bagatazojiz_sidatasofugugor_sofaxazute_gureluf.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/ee4d5980-09d4-463a-b5d1-26e093ceab66/95943372259.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f41af2f2-3d57-46aa-9084-0e83a2a4c36f/titovivolowodurukufa.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e0953e65-3987-4548-b2cc-ae33a6340d42/rogajudijef.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/2e86523a-c3f3-43cb-829f-f5536fe13f13/sodunedabo.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/70ed9646-5cef-4bc1-b598-aeda62ef636f/kulaw.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000063bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x63BB	5396 bytes
SHA-256: `d2a7087432ef3630cc2082f9c72b3a620a5353d6d8a776e2a3b255009b85a65a`
`font_01_sfnt_off000075ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x75EF	12488 bytes
SHA-256: `cdf80315cee97cf76259705303904ca8e91ba6de0f2baf4d98ce087d6c3c2026`

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