PDF malware analysis — malicious · 31f900fb9ff46893

MALICIOUS

PDF

46.6 KB Created: 2020-10-14 05:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23

MD5: bebfc7c37dd62d122fbce9ff9919243a SHA-1: ed6d8eed6f21199b11881ac262f6c88c226fa2e5 SHA-256: 31f900fb9ff468939146ae9e92e903a8738e95bd8527f2cb4f2685d407a43d82

192 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to disposable hosting services, and one critical link to a known malicious redirector. The ML classifier strongly indicates maliciousness, and the heuristics confirm the presence of a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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=clarice+bean+tem+um+problema+pdf In PDF document text
- https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/digokasawuj-jipamuputevuf.pdfIn PDF document text
- https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/dekegu.pdfIn PDF document text
- https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/sefaritonos-nukivafeka-retisebop-regaxumex.pdfIn PDF document text
- https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/5650151.pdfIn PDF document text
- https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/1000608.pdfIn PDF document text
- https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/kedoxezezaj-temolej-zunemalavorun-mutelokowomimi.pdfIn PDF document text
- https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/zikarab.pdfIn PDF document text
- https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/7922058.pdfIn PDF document text
- https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/tunitulo.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/1/0432/5841/3216/files/medieval_warfare_reforged_hack_script.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/25e30f4d-d9eb-437b-956e-fe6ce7978eb2/wotimofulajol.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b7b1b31c-60a2-46ba-81f1-c1c9cfaa6b1d/kuxiremivoberesunurodifef.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/10017d77-dce9-4f94-92f1-ae7cbc9ce1e6/78886608231.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d4f62089-acca-4012-ae3b-5709f970a127/229312744.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
- http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
- http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00006d2a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6D2A	5168 bytes
SHA-256: `f5cb71f5aeb60206ee8bcbe9cd79ff51ca380453fec26fd6cb16768c2f1192ee`
`font_01_sfnt_off00007e93.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7E93	3768 bytes
SHA-256: `fc27e450a1ad946540617872dfffd4453c02f71f4a8c57fff47cf00373353501`
`font_02_sfnt_off00008a2b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8A2B	10120 bytes
SHA-256: `70c3601cd34d589f77d98f143016b3f5b2620690382897f5902d1b3b3c3e6327`

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