PDF malware analysis — malicious · baa5f476ab38be94

MALICIOUS

PDF

50.4 KB Created: 2020-10-09 15:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26

MD5: bd3e231971b6cfbd88ab8c35442bf207 SHA-1: ef427a986d464755fa0a8886470ed2a766eded34 SHA-256: baa5f476ab38be94def2c3bd6f5ad16a912bb48d28e553050483879ce54ba4fa

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document functions as a link farm, containing numerous embedded URLs that point to other PDF files. One of these URLs, https://cctraff.ru/strik?keyword=cva+wolf+reviews+2018, is identified as a known malicious redirector. The document's structure and the presence of a malicious redirector suggest an attempt to lead users to malicious content, likely for further exploitation or phishing. No scripts were extracted from this sample.

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://cctraff.ru/strik?keyword=cva+wolf+reviews+2018 In PDF document text
- https://site-1039898.mozfiles.com/files/1039898/fefivewuwale.pdfIn PDF document text
- https://site-1037245.mozfiles.com/files/1037245/sozixuzipiburo.pdfIn PDF document text
- https://site-1036868.mozfiles.com/files/1036868/tilufewiwaxiguxowaboga.pdfIn PDF document text
- https://site-1036722.mozfiles.com/files/1036722/josubed.pdfIn PDF document text
- https://site-1038572.mozfiles.com/files/1038572/tukawigopukuwitemijawowa.pdfIn PDF document text
- http://gafebezel.marianrichetta.com/uploads/1/3/2/6/132695601/fefofabikadud_dezaruxuvijaz.pdfIn PDF document text
- http://maxefa.encognize.com/uploads/1/3/2/7/132712435/9778159.pdfIn PDF document text
- http://files.gofriendyourselfdoc.com/uploads/1/3/1/4/131438046/855d7e075742.pdfIn PDF document text
- https://site-1038339.mozfiles.com/files/1038339/25364727424.pdfIn PDF document text
- https://site-1039400.mozfiles.com/files/1039400/62953629558.pdfIn PDF document text
- https://site-1043297.mozfiles.com/files/1043297/24946799449.pdfIn PDF document text
- https://site-1039514.mozfiles.com/files/1039514/87608243928.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://cdn.shopify.com/s/files/1/0459/5443/3183/files/45818309242.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0496/5348/1625/files/why_does_the_renaissance_began_in_italy.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0434/4948/3426/files/56383934605.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0430/6265/7177/files/jarebenutatog.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0485/1839/8107/files/38644583057.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_off0000782c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x782C	5056 bytes
SHA-256: `56ad8a1b06b23b834a4fcd44883c9b73443880cdeec43c6be005e1be72c8a9ba`
`font_01_sfnt_off00008980.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8980	10748 bytes
SHA-256: `876ea0be3ac3a83cf34b5dcc8010844cba753b13173df1402ba26b3ce5ed3df6`
`font_02_sfnt_off0000ae36.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAE36	4324 bytes
SHA-256: `cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34`

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