PDF malware analysis — malicious · 16bf6d2537ea8043

MALICIOUS

PDF

43.2 KB Created: 2020-10-15 16:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22

MD5: 7c7171968f5cd2d71f636246a9265838 SHA-1: 59a1b5bfced13649524fcfe0377fe40bf746fd90 SHA-256: 16bf6d2537ea8043076af682277bae5ef882a122014456bed8105aa7a2990cf9

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to known malicious redirector infrastructure or disposable hosting. The document body, though heavily obfuscated, contains keywords related to 'O'reilly books javascript pdf' and the authoring application 'wkhtmltopdf', suggesting a lure for specific content. The ML classifier strongly indicated maliciousness, and the heuristics confirm the presence of malicious redirector links and a link farm.

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://gettraff.ru/123?keyword=o%2527reilly+books+javascript+pdf In PDF document text
- https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/mukitijaxuxisevoj.pdfIn PDF document text
- https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/bosos_dawozerulagata_gezopisomugujin_sozijawa.pdfIn PDF document text
- https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/1667499.pdfIn PDF document text
- https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/7fb30dd.pdfIn PDF document text
- https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/linurigaruxox.pdfIn PDF document text
- https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/niluvozenobe.pdfIn PDF document text
- https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/cc4139.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4365624/normal_5f873a795eac2.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366302/normal_5f87c7aa19dbb.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/1b9e2a5c-137a-479f-9481-b8ee74308d9d/wawiwevig.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/50c4f7c2-1b2b-45df-99fe-3c10aaef93e8/92022484240.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/877250a0-69dd-4786-9cf3-f8868358f5eb/52029512331.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b4ac8ce4-7e89-4f3a-8d73-8fc4364958c9/96504098963.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/cdca58d4-3725-4ce3-898f-aa764b8abaa6/68844211833.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0496/0685/2757/files/buford_t_justice_what_the_hell_is_the_world_coming_to.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0493/0191/3759/files/mapquest_gps_apk.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0428/9101/8396/files/radebaxojid.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0486/0834/6270/files/catching_fire_free_online_book.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0482/9377/3476/files/78069212237.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_off00006a5c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6A5C	5652 bytes
SHA-256: `471fab458e6bfef88370b3afbe59b50a07a76e0f23b4af77f28f728107f00ee3`
`font_01_sfnt_off00007db9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7DB9	9980 bytes
SHA-256: `493a8df8a50ba35fe7e17cb90bfde98b276e4a8a7f1dd0ab51c5f847d53210f0`

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