PDF malware analysis — malicious · 24698641601d446d

MALICIOUS

PDF

44.0 KB Created: 2020-10-29 07:08:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22

MD5: a0c84ce99e55879e29042e9724256c94 SHA-1: 798929abb9519d5e08496b0ba327af4168515230 SHA-256: 24698641601d446d456d4a2be672230ec85231daf25cb7fe3c4de972f615361f

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded URLs, forming a link farm, and specifically links to a known malicious redirector. The document body, though obfuscated, contains the text "Forbidden knowledge book pdf" and the malicious URL, suggesting a lure to trick users into visiting a potentially harmful site. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
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/aws?keyword=forbidden+knowledge+book+pdf In PDF document text
- https://cdn-cms.f-static.net/uploads/4378613/normal_5f970243cc972.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4388405/normal_5f8de080abd72.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4365998/normal_5f87178b55015.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4367644/normal_5f8809818dcbe.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4422378/normal_5f980d6260446.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366005/normal_5f88b0e1e3eeb.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379971/normal_5f8ce3dd1cc57.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4390069/normal_5f8f537519e9b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366982/normal_5f874f244a3de.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366400/normal_5f8740d9ed998.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4372373/normal_5f91d03b785f0.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4408995/normal_5f99b45b835f1.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://cdn.shopify.com/s/files/1/0507/1857/2704/files/gumutewujezejagenuwuk.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0435/5509/4689/files/fupunazev.pdfIn PDF document text
- https://s3.amazonaws.com/wiwamoxamo/97449364308.pdfIn PDF document text
- https://s3.amazonaws.com/zazelujeju/flamenco_guitar_method_for_beginners.pdfIn PDF document text
- https://s3.amazonaws.com/leguvefu/kikifipewaxuzigo.pdfIn PDF document text
- https://s3.amazonaws.com/limewub/60440086609.pdfIn PDF document text
- https://s3.amazonaws.com/vuraradaso/september_2018_calendar_telugu.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0499/8361/9232/files/vidadizezagegafupulijejom.pdfIn PDF document text
- https://s3.amazonaws.com/muxozuvalubi/68370637817.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.

Filename	Kind	Source	Size
`font_00_sfnt_off000064a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x64A1	5072 bytes
SHA-256: `2c8cde7a1c2fadd6547c2881644b91f5cbbd2134e0c82489b0cbfe1a8eaf0e40`
`font_01_sfnt_off00007602.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7602	2012 bytes
SHA-256: `635ab073feb9f1310414136ae948304a01733549f1d864f5a10a2cf3fbc36a3f`
`font_02_sfnt_off00007f60.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7F60	10264 bytes
SHA-256: `e69955eb71e4eacf4ddbbac7d63c3220aa196134ff55032a6c8fa950c3eee5c8`

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