PDF malware analysis — malicious · 49f9d7514ea103c5

MALICIOUS

PDF

48.7 KB Created: 2020-09-30 19:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23

MD5: 095504169d5e4dd4710b2490799162e3 SHA-1: 9cdb56b5fe9bbfadf9615df85c1ad68dedade39c SHA-256: 49f9d7514ea103c5c15ecbefc1b7a26ed0eaa1dbfbd94cacf3e7fe2fa5b7720b

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://cctraff.ru/strik?keyword=chapter+10+lord+of+the+flies+pdf'. The document also functions as a link farm, pointing to many other PDFs hosted on various domains, some of which are on disposable hosting. While no scripts were extracted, the presence of malicious redirector links suggests an intent to lead users to harmful content.

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=chapter+10+lord+of+the+flies+pdf In PDF document text
- http://jiriso.medinaguitars.com/uploads/1/3/2/8/132814432/8c19e6f.pdfIn PDF document text
- http://files.kristinhardydesign.com/uploads/1/3/1/3/131381607/xoveradozowelaz.pdfIn PDF document text
- http://zeraguf.worldhumanities.org/uploads/1/3/1/4/131406258/fugupebuse.pdfIn PDF document text
- http://foderonu.therebelcarpenter.com/uploads/1/3/1/3/131383790/sozibudo.pdfIn PDF document text
- http://files.learningonramps.org/uploads/1/3/1/3/131381363/tujemor.pdfIn PDF document text
- http://detebizel.dirainternational.com/uploads/1/3/0/8/130813668/3376265.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://uploads.strikinglycdn.com/files/05b4029e-0e78-4089-b9ff-0fb3322b937b/41493512903.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a380911f-c4f9-451b-8e82-007782484ea5/seferopezazani.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/6dbb32a0-d20a-4ae7-9f80-435928926276/718953377.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9099cd7b-83bf-4729-ab6b-e9910c88de4e/vijaluxabopuxavaxemaxuve.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/5b9a6b95-9ad4-49dd-8ad1-825d31b62997/52468636304.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0431/9635/0626/files/maquinas_electricas_chapman_4ta_edicion.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0433/4711/6197/files/64084551292.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0437/9358/0181/files/xesikogurowene.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0429/8178/5753/files/baidu_spark_browser_windows_10.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0437/9806/9410/files/guvar.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_off000071d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x71D6	5028 bytes
SHA-256: `de960b17db1c609c45a7d9f57404ee3db5d91f74d9f1fc477998372728c7f49f`
`font_01_sfnt_off00008309.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8309	10796 bytes
SHA-256: `313c774ad014a0142cfe5dd6e75d227558985cc5c3b74567cd386a65787e6ce2`
`font_02_sfnt_off0000a7e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA7E3	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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